Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
Activate Urza, Prince of Kroog by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Urza, Lord High Artificer's first ability by tapping the Training Grounds token, adding .
Repeat from step 5.

You have a static effect that grants your creatures haste.

Activate Scrap Welder by tapping it, sacrificing itself and returning Goblin Welder from your graveyard to the battlefield.
Activate Goblin Welder by tapping it, sacrificing itself and returning Scrap Welder from your graveyard to the battlefield.
Repeat.

Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
When the Pincher enters the battlefield, Blasting Station triggers, untapping itself.
Activate Blasting Station by tapping it and sacrificing the Pincher.
When the Pincher dies, Summoning Station triggers, untapping itself.
Resolve the Blasting Station ability, dealing 1 damage to any target.
Repeat.

Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
The Pincher enters the battlefield as an artifact due to Encroaching Mycosynth, triggering Grinding Station, untapping it.
Activate Grinding Station by tapping it and sacrificing the Pincher.
When the Pincher dies, Summoning Station triggers, untapping itself.
Resolve the Grinding Station ability, causing target player to mill three cards.
Repeat.

Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
Activate Ashnod's Altar by sacrificing the Pincher, adding .
The Pincher dies, triggering Summoning Station, untapping itself.
Repeat.

Activate Clock of Omens by tapping Magda and another artifact, targeting Magda.
Magda triggers, creating a Treasure token.
Resolve the Clock of Omens ability, untapping Magda.
Repeat.

You control an additional creature.

Activate Jan Jansen's first ability by tapping it and sacrificing a creature, creating two Treasure tokens.
Activate Clock of Omens by tapping the two Treasure tokens, untapping Jan Jansen.
Activate Jan Jansen's second ability by tapping it and sacrificing a Treasure token, creating two 1/1 Construct creature tokens.
Activate Clock of Omens by tapping the two Construct tokens, untapping Jan Jansen.
Repeat.

Goblin Welder does not have summoning sickness.
You control at least one other nontoken artifact creature.
You have at least one artifact creature card in your graveyard.

Activate Goblin Welder by tapping it, sacrificing any artifact creature you control and returning any other artifact creature from your graveyard to the battlefield.
The sacrificed creature dies, triggering Dross Scorpion, untapping Goblin Welder.
Repeat.

Saheeli Rai has at least two loyalty counters on it.

Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of itself that is an artifact in addition to its other types.
Repeat.

Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
Activate Phyrexian Altar by sacrificing the Pincher, adding one mana of any color.
The Pincher dies, triggering Summoning Station, untapping itself.
Repeat.

Freed from the Real attached to Vedalken Engineer.
Vedalken Engineer does not have summoning sickness.

Activate Vedalken Engineer by tapping it, adding .
Activate Freed from the Real's second ability by paying , untapping Vedalken Engineer.
Repeat.

Saheeli has at least four loyalty counters.

Cast Deepglow Skate by paying .
When Deepglow Skate enters the battlefield, it triggers, doubling the number of loyalty counters on Saheeli.
Activate Saheeli's third loyalty ability by removing seven loyalty counters from it, creating a token copy of each permanent you control.
Put the nontoken Saheeli into your graveyard due to the legend rule.
When the Deepglow Skate token enters the battlefield, it triggers, doubling the number of loyalty counters on Saheeli.
Repeat from step 3.

Emry does not have summoning sickness.

Activate Emry by tapping it, allowing you to cast Walking Ballista from your graveyard this turn.
Cast Walking Ballista by paying .
Walking Ballista enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

Emry does not have summoning sickness.

Activate Emry by tapping it, allowing you to cast Hangarback Walker from your graveyard this turn.
Cast Hangarback Walker by paying .
Hangarback Walker enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

Pemmin's Aura attached to Vedalken Engineer.
Vedalken Engineer does not have summoning sickness.

Activate Vedalken Engineer by tapping it, adding .
Activate Pemmin's Aura's first ability by paying , untapping Vedalken Engineer.
Repeat.

Opponents control at least seven artifacts and/or enchantments.

Activate Urza by paying , creating a token copy of Dockside Extortionist that is a 1/1 Soldier in addition to its other types.
The Dockside Extortionist token enters the battlefield, creating at least seven Treasure tokens.
Activate six Treasure tokens by tapping and sacrificing them, adding .
Repeat.
Once you have infinite mana and Treasure tokens, you may use Urza to make infinite copies of any permanents you control.

Emry does not have summoning sickness.

Activate Emry by tapping it, allowing you to cast Stonecoil Serpent from your graveyard this turn.
Cast Stonecoil Serpent by paying .
Stonecoil Serpent enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

Opponents control at least five artifacts and/or enchantments.

Cast Dockside Extortionist by paying .
When Dockside Extortionist enters the battlefield, it triggers, creating at least five Treasure tokens.
Activate four Treasures by tapping and sacrificing them, adding .
Activate Drafna's first ability by paying , returning Dockside Extortionist from the battlefield to your hand.
Repeat.

Saheeli Rai has at least two loyalty counters on it.

Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of itself that is an artifact in addition to its other types.
Repeat.

Vorel does not have summoning sickness.
Teferi has at least six loyalty counters on it.

Activate Vorel by paying and tapping it, doubling the number of loyalty counters on Teferi.
Activate Teferi's third loyalty ability by removing ten loyalty counters from it, causing you to take two extra turns after this one.
Move to your first extra turn.
Activate Teferi's first loyalty ability by putting a loyalty counter on it, causing you to loot.
Activate Vorel by paying and tapping it, doubling the number of loyalty counters on Teferi.
Move to your second extra turn.
Repeat.

Cast Leonin Relic-Warder by paying .
When Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling itself.
When Leonin Relic-Warder leaves the battlefield, its second ability triggers, returning itself from exile to the battlefield.
Repeat from step 2.

Activate Urza by paying , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Grand Architect's second ability by tapping the Training Grounds token, adding that can only be spent to cast artifact spells or to activate abilities of artifacts.
Activate Urza by paying at most , creating a token copy of Training Grounds that is a 1/1 Soldier in addition to its other types.
Activate Grand Architect's second ability by tapping the Training Grounds token, adding that can only be spent to cast artifact spells or to activate abilities of artifacts.
Repeat from step 3.
Once you have infinite colorless mana, you may target any other nonland permanent using Urza's ability.

Activate Summoning Station by tapping it, creating a 2/2 Pincher creature token.
Activate Altar of Dementia by sacrificing the Pincher.
The Pincher dies, triggering Summoning Station, untapping itself.
Resolve the Altar of Dementia trigger, causing target player to mill cards equal to the Pincher's power.
Repeat.

You have the city's blessing.
Timestream Navigator does not have summoning sickness.

Activate Urza by paying , creating a token copy of Timestream Navigator that is a 1/1 Soldier creature.
Activate the oldest Timestream Navigator by paying , tapping it and putting it on the bottom of your library from the battlefield, causing you to take an extra turn after this one.
Repeat each turn.

Tana has power five or greater, does not have summoning sickness and cannot be blocked by an opponent.

Deal combat damage to an opponent using Tana.
Tana triggers, creating at least five 1/1 Saproling creature tokens.
Activate Time Sieve by tapping it and sacrificing five Saprolings, causing you to take an extra turn after this one.
Repeat each turn.

Activate Steelswarm Operator's second ability by tapping it, adding that can only be spent to activate abilities of artifacts.
Activate Freed from the Real by paying , untapping Steelswarm Operator.
Repeat.

Once you have infinite mana, you can use Steelswarm Operator's first ability instead.

Saheeli Rai has at least two loyalty counters on it.

Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of itself that is an artifact in addition to its other types.
Repeat.

You control an additional creature.

Activate Jan Jansen's first ability by tapping it and sacrificing another artifact creature.
When the creature dies, Dross Scorpion triggers, untapping Jan Jansen.
Resolve the Jan Jansen ability, creating two Treasure artifact tokens.
Activate Jan Jansen's second ability by tapping it and sacrificing a Treasure token, creating two 1/1 Construct artifact creature tokens.
Activate a Treasure token by tapping and sacrificing it, adding .
Activate Skullclamp's equip ability by paying , attaching it to a Construct token.
The Construct dies as a state-based action due to having zero toughness.
Skullclamp and Dross Scorpion trigger.
Resolve the Skullclamp trigger, causing you to draw two cards.
Resolve the Dross Scorpion trigger, untapping Jan Jansen.
Repeat.

You control at least one additional Goblin.

Activate Skirk Prospector by sacrificing another Goblin, adding .
When the Goblin dies, Krenko triggers, causing you to pay to create a 1/1 Goblin creature token.
Repeat.

Emry does not have summoning sickness.

Activate Emry by tapping it, allowing you to cast Shifting Wall from your graveyard this turn.
Cast Shifting Wall by paying .
Shifting Wall enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

You control at least eight permanents and/or have the city's blessing.

If Drafna has summoning sickness, activate Swiftfoot Boots' equip ability by paying , attaching it to Drafna.
Cast Timestream Navigator by paying .
Holding priority, activate Drafna's second ability by paying and tapping it, copying Timestream Navigator.
When the Timestream Navigators enter the battlefield, if you do not have the city's blessing, they trigger, giving you the city's blessing.
Activate Drafna's first ability by paying , returning the nontoken Timestream Navigator from the battlefield to your hand.
Activate Swiftfoot Boots' equip ability by paying , attaching it to the Timestream Navigator token.
Activate the Timestream Navigator token by paying , tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one.
Repeat from step 2 each turn.

You control at least eight permanents and/or have the city's blessing.

If Drafna has summoning sickness, activate Lightning Greaves' equip ability by paying , attaching it to Drafna.
Cast Timestream Navigator by paying .
Holding priority, activate Drafna's second ability by paying and tapping it, copying Timestream Navigator.
When the Timestream Navigators enter the battlefield, if you do not have the city's blessing, they trigger, giving you the city's blessing.
Activate Drafna's first ability by paying , returning the nontoken Timestream Navigator from the battlefield to your hand.
Activate Lightning Greaves' equip ability by paying , attaching it to the Timestream Navigator token.
Activate the Timestream Navigator token by paying , tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one.
Repeat from step 2 each turn.

Saheeli Rai has at least two loyalty counters on it.

Activate Saheeli Rai's second loyalty ability by removing two loyalty counters from it, creating a token copy of itself that is an artifact in addition to its other types.
Repeat.

You control at least one additional nonland permanent.

Activate Krark-Clan Ironworks by sacrificing another nonland permanent, adding .
Because the permanent is a Clue artifact due to Encroaching Mycosynth and Senator Peacock, Ulvenwald Mysteries' second ability triggers, creating a 1/1 Human Soldier creature token that is also a Clue artifact.
Repeat.
Once you have infinite mana, you may instead sacrifice the Human Soldiers to their own abilities to draw infinite cards.

Fain does not have summoning sickness.
You control at least one additional creature.

Activate Fain's third ability by tapping it and sacrificing an creature, which is an artifact due to Encroaching Mycosynth.
When the creature dies, Dross Scorpion triggers, untapping Fain.
Resolve the Fain ability from step 1, creating a 2/1 Inkling creature token that is an artifact due to Encroaching Mycosynth.
Repeat.

Aether Storm prevents creature spells from being cast.
Darksteel Forge prevents Aether Storm from being destroyed due to its ability.

Fain does not have summoning sickness.
You control at least one additional permanent.

Activate Fain's third ability by tapping it and sacrificing an artifact, creating a 2/1 Inkling creature token that is an artifact due to Encroaching Mycosynth.
When the Inkling enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Vorel does not have summoning sickness.
Mu Yanling has at least ten loyalty counters on it.

Activate Vorel by paying and tapping it, doubling the number of loyalty counters on Mu Yanling.
Activate Mu Yanling's third loyalty ability by removing ten loyalty counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Activate Clock of Omens by tapping Stonybrook Schoolmaster and another artifact, targeting Stonybrook Schoolmaster.
Stonybrook Schoolmaster triggers, creating a 1/1 Merfolk Wizard creature token that is also an artifact due to Encroaching Mycosynth.
Resolve the Clock of Omens ability, untapping Stonybrook Schoolmaster.
Repeat.

Freed from the Real attached to Magda.

Activate Urza's first ability by tapping Magda, adding .
Magda triggers, creating a Treasure artifact token.
Activate Freed from the Real's second ability by paying , untapping Magda.
Repeat.
Once you have infinite Treasure tokens and colored mana, you may use it to activate Urza's second ability.

Vorel of the Hull Clade does not have summoning sickness.
Kiora has at least 12 loyalty counters on it.

Activate Vorel of the Hull Clade by paying and tapping it, doubling the number of counters on Kiora.
Activate Kiora by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Vorel of the Hull Clade does not have summoning sickness.
Ugin has at least 12 loyalty counters on it.

Activate Vorel of the Hull Clade by paying and tapping it, doubling the number of counters on Ugin.
Activate Ugin by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Activate Clock of Omens by tapping Emmara and another artifact, targeting Emmara.
Emmara triggers, creating a 1/1 Soldier creature token that is also an artifact due to Encroaching Mycosynth.
Resolve the Clock of Omens ability, untapping Emmara.
Repeat.

Activate Steelswarm Operator's second ability by tapping it, adding that can only be spent to activate abilities of artifacts.
Activate Pemmin's Aura by paying , untapping Steelswarm Operator.
Repeat.

Once you have infinite mana, you can use Steelswarm Operator's first ability instead.

Cast Army of the Damned by paying , creating thirteen 2/2 Zombie creature tokens that are artifacts due to Mycosynth Lattice.
At the beginning of your next upkeep, Mechanized Production triggers, creating a token copy of the artifact it is attached to, and causing you to win the game.

Emry does not have summoning sickness.

Activate Emry by tapping it, allowing you to cast Phyrexian Marauder from your graveyard this turn.
Cast Phyrexian Marauder by paying .
Phyrexian Marauder enters the battlefield and dies as a state-based action due to having zero toughness.
Dross Scorpion triggers, untapping Emry.
Repeat.

You control at least one additional creature.

Activate Phyrexian Altar by sacrificing another creature, adding .
When the creature dies, Krenko triggers, causing you to pay to create a 1/1 Goblin creature token.
Repeat.

Activate Witch's Oven by tapping it and sacrificing Cauldron Familiar.
When Cauldron Familiar dies, Dross Scorpion triggers, untapping Witch's Oven.
Resolve the Witch's Oven ability, creating a Food artifact token.
Activate Cauldron Familiar by sacrificing a Food token, returning it from your graveyard to the battlefield.
When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain 1 life.
Repeat.

Vorel of the Hull Clade does not have summoning sickness.
Karn Liberated has at least 12 loyalty counters on it.

Activate Vorel of the Hull Clade by paying and tapping it, doubling the number of counters on Karn Liberated.
Activate Karn Liberated by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat each turn.

You control an additional creature.

Activate Jan Jansen's first ability by tapping it and sacrificing another artifact creature.
When the creature dies, Dross Scorpion triggers, untapping Jan Jansen.
Resolve the Jan Jansen ability, creating four Treasure tokens.
Activate Jan Jansen's second ability by tapping it and sacrificing a Treasure token, creating four 1/1 Construct artifact creature tokens.
Activate three Treasures by tapping and sacrificing them, adding .
Activate Mondrak by paying and sacrificing two Constructs.
When the Constructs die, Dross Scorpion triggers twice.
Resolve the first trigger, untapping Jan Jansen.
Repeat steps 1 through 4 one additional time.
Resolve the second Dross Scorpion trigger from step 7, untapping Jan Jansen.
Resolve the Mondrak ability from step 6, putting an indestructible counter on it.
Repeat.

You control at least eight permanents and/or have the city's blessing.

Cast Timestream Navigator by paying .
Holding priority, activate Drafna's second ability by paying and tapping it, copying Timestream Navigator.
When the Timestream Navigators enter the battlefield, if you do not have the city's blessing, they trigger, giving you the city's blessing.
Activate Drafna's first ability by paying , returning the nontoken Timestream Navigator from the battlefield to your hand.
Activate the Timestream Navigator token by paying , tapping it and putting it on the bottom of your library, causing you to take an extra turn after this one.
Repeat from step 2 each turn.

You've cast your commander from the command zone at least once this game.

Cast Echo Storm by paying , targeting Dualcaster Mage.
Echo Storm triggers, creating a copy of itself, targeting Dualcaster Mage.
Resolve the copy of Echo Storm, creating a token copy of Dualcaster Mage.
When the Dualcaster Mage token enters the battlefield, it triggers, creating a copy of Echo Storm, targeting Dualcaster Mage.
Repeat from step 3.

Vorel of the Hull Clade does not have summoning sickness.
Nissa has at least 12 loyalty counters on it.

Activate Vorel of the Hull Clade by paying and tapping it, doubling the number of counters on Nissa.
Activate Nissa by removing twelve loyalty counters from it, causing you to take an extra turn after this one.
Repeat each turn.

Othelm does not have summoning sickness.

Activate Ashnod's Altar by sacrificing Dross Scorpion, adding .
When Dross Scorpion dies, it triggers, untapping Othelm.
Activate Othelm by paying and tapping it, returning Dross Scorpion from your graveyard to the battlefield.
Repeat.

Activate Vhal by tapping it, adding at least .
Activate Voltaic Construct by paying , untapping Vhal.
Repeat

Aether Storm prevents creature spells from being cast.
Because Damping Matrix prevents Aether Storm's activated ability from being activated, it cannot be destroyed due to its ability.

Activate Cogwork Assembler by paying , creating a token copy of Rasputin Dreamweaver with haste.
Put the oldest Rasputin Dreamweaver into your graveyard due to the legend rule.
Activate Rasputin Dreamweaver's first ability seven times by removing seven dream counters from it, adding seven .
Repeat.

You control at least ten Zombies.

At the beginning of your upkeep, Endless Ranks of the Dead triggers, creating at least five 2/2 Zombie creature tokens that are artifacts due to Encroaching Mycosynth.
Activate Time Sieve by tapping it and sacrificing five Zombies, causing you to take an extra turn after this one.
Repeat each turn.

Pemmin's Aura attached to Magda.

Activate Urza's first ability by tapping Magda, adding .
Magda triggers, creating a Treasure artifact token.
Activate Pemmin's Aura's first ability by paying , untapping Magda.
Repeat.
Once you have infinite Treasure tokens and colored mana, you may use it to activate Urza's second ability.

You control creatures that can produce at least .
Emry does not have summoning sickness.

Activate creatures you control by tapping them, adding at least .
Activate Emry by tapping them, allowing you to cast Out of Time from your graveyard this turn.
Cast Out of Time from your graveyard by paying .
Out of Time enters the battlefield.
In response to its trigger, activate Krark-Clan Ironworks by sacrificing Out of Time, adding .
Resolve Out of Time's trigger, untapping all creatures then failing to phase them out since Out of Time has left the battlefield.
Repeat.

Elemental Mastery attached to a creature you control that has power 5 or greater and that does not have summoning sickness.

Activate the creature with Elemental Mastery attached by tapping it, creating at least five 1/1 Elemental creature tokens.
Activate Time Sieve by tapping it and sacrificing five Elemental tokens, causing you to take an extra turn after this one.
Repeat each turn.

Opponents cannot block and kill creatures you control.
You have at least two opponents.

Declare Combat Celebrant as an attacker, choosing to exert it as it attacks.
Combat Celebrant's myriad and printed abilities trigger.
Resolve the myriad trigger, creating a token copy of Combat Celebrant attacking each other opponent.
Resolve the second trigger, causing you to untap all other creatures you control and to get an additional combat phase after this one.
Move to your next combat phase, not exiling the Combat Celebrant tokens due to The Master.
Repeat using a Combat Celebrant token that hasn't attacked this turn.

You control an additional nonland permanent.
An additional creature with mana value 2 or less in graveyard.
At least three loyalty counters on Daretti.

Activate Daretti's second ability by removing two loyalty counters from them, sacrificing any other nonland permanent and returning Technomancer from your graveyard to the battlefield.
Technomancer enters the battlefield, milling three cards and returning Phyrexian Metamorph and any creature cards with total mana value 2 or less from your graveyard to the battlefield.
Phyrexian Metamorph enters the battlefield as a copy of Daretti.
Put the original Daretti in your graveyard due to the legend rule.
Activate Phyrexian Metamorph's second ability by removing two loyalty counters from it, sacrificing Technomancer and returning Daretti from your graveyard to the battlefield.
Put Phyrexian Metamorph in your graveyard due to the legend rule.
Activate Daretti's second ability by removing two loyalty counters from them, sacrificing one of the creatures returned in step 2 and returning Technomancer from your graveyard to the battlefield.
Repeat from step 2.

You've cast your commander from the command zone at least once this game.

Cast Echo Storm by paying , targeting Naru Meha.
Echo Storm triggers, creating a copy of itself, targeting Naru Meha.
Resolve the copy of Echo Storm, creating a token copy of Naru Meha.
Put the token Naru Meha into your graveyard due to the legend rule.
The Naru Meha token's enters-the-battlefield ability triggers, creating a copy of Echo Storm, targeting Naru Meha.
Repeat from step 3.

Aether Storm prevents creature spells from being cast.
Null Rod prevents Aether Storm's ability from being activated to destroy it.

You control up to seven lands that can tap to produce at least .

Activate up to seven lands you control by tapping them, adding at least .
Activate Cogwork Assembler by paying , creating a token copy of Palinchron with haste.
The token Palinchron enters the battlefield, untapping up to seven lands.
Repeat.

You control at least three Humans.

Activate Horn of Gondor by paying and tapping it, creating at least three 1/1 Human Soldier creature tokens.
Activate Clock of Omens by tapping two Human Soldiers, untapping Horn of Gondor.
Activate Krark-Clan Ironworks twice by sacrificing two Human Soldiers, adding .
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Krark-Clan Ironworks by sacrificing the creature with bloodthirst, adding .
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Ashnod's Altar by sacrificing the creature with bloodthirst, adding .
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Arcbound Ravager by sacrificing the creature with bloodthirst.
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Resolve the Arcbound Ravager ability, putting a +1/+1 counter on it.
Repeat.

Activate Gyre Sage by tapping it, adding at least .
Activate Voltaic Construct by paying , untapping Gyre Sage.
Repeat

You control at least one additional creature.

Activate Thermopod's second ability by sacrificing another creature, adding .
When the creature dies, Krenko triggers, causing you to pay to create a 1/1 Goblin creature token.
Repeat.

Whenever a creature enters the battlefield, Lethal Vapors triggers, destroying that creature.
Because Null Rod prevents Lethal Vapors's activated ability from being activated, it cannot be destroyed due to its ability.

Whenever a creature enters the battlefield, Lethal Vapors triggers, destroying that creature.
Because Damping Matrix prevents Lethal Vapors's activated ability from being activated, it cannot be destroyed due to its ability.

Cast Red Sun's Twilight with X equal to 5 by paying .
In response, cast Dualcaster Mage by paying .
Dualcaster Mage enters the battlefield, copying Red Sun's Twilight targeting itself and up to four other artifacts.
Resolve that copy, destroying all its targets then creating a token copy of each artifact destroyed.
Repeat from step 3.

Aether Storm prevents creature spells from being cast.
Stony Silence prevents Aether Storm's ability from being activated to destroy it.

You control at least five other creatures.

Activate Time Sieve by tapping it and sacrificing five other creatures.
When the creatures die as Clerics due to Maskwood Nexus, Rotlung Reanimator triggers five times, creating five 2/2 Zombie creature tokens.
Resolve the Time Sieve ability, causing you to take an extra turn after this one.
Repeat each turn.

Lightning-Rig Crew does not have summoning sickness.
You have at least two opponents.

Activate Lightning-Rig Crew by tapping it, dealing 1 damage to each opponent.
Malcolm triggers, creating a Treasure artifact token for each opponent dealt damage this way.
Activate Clock of Omens by tapping two Treasures, untapping Lightning-Rig Crew.
Repeat until you have one or less opponent remaining.

You control a nonlegendary creature with mana value eight or greater.
Slobad does not have summoning sickness.

Activate Cogwork Assembler by paying , creating a token copy of any nonlegendary artifact with mana value eight or greater.
Activate Slobad by tapping it and sacrificing the artifact creature token, adding at least eight that can only be spent to activate abilities of artifacts or to cast artifact spells.
The artifact creature token dies, triggering Dross Scorpion, untapping Slobad.
Repeat.

Cast Scrap Mastery by paying .
In response, cast Dualcaster Mage by paying .
Dualcaster Mage enters the battlefield, copying Scrap Mastery.
Activate Altar of Dementia by sacrificing Dualcaster Mage, causing any player to mill two cards.
Resolve a copy of Scrap Mastery, swapping all nonland permanents you control with all nonland permanents in your graveyard.
Repeat from step 3.

"Mirran" chosen with Mirrodin Besieged.

Cast Glint Hawk by paying .
Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token.
Activate Phyrexian Altar by sacrificing a Myr, adding .
Glint Hawk enters the battlefield, returning itself to your hand.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Yahenni by sacrificing the creature with bloodthirst.
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Resolve the Yahenni ability.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Viscera Seer by sacrificing the creature with bloodthirst.
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Resolve the Viscera Seer ability, causing you to scry 1.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Goblin Bombardment by sacrificing the creature with bloodthirst.
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Resolve the Goblin Bombardment ability, dealing 1 damage to any target.
Repeat.

An opponent was dealt damage this turn.
The creature with bloodthirst does not have a -1/-1 counter on it.

Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
Activate Carrion Feeder by sacrificing the creature with bloodthirst.
When the creature dies, its persist ability and Dross Scorpion trigger.
Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
Repeat.