You control at least five legendary creatures that do not have summoning sickness.
An opponent cannot block creatures you control.

Declare at least five legendary creatures you control as attackers.
If you declared any Warriors as attackers, Najeela triggers for each Warrior, creating that many 1/1 Warrior creature tokens that are tapped and attacking.
Activate five attacking legendary creatures by tapping them, adding .
Activate Najeela by paying , untapping all attacking creatures, giving them trample, lifelink and haste, and gaining an additional combat phase after this one.
Repeat each combat phase.

Creatures you control (including legendary creatures) can tap to produce at least .

Activate any number of creatures by tapping them, adding at least .
Activate Aggravated Assault by paying , causing you to untap all creatures you control and to get an additional combat and main phase after this one.
Repeat each combat phase.

You control at least five legendary creatures without summoning sickness.

Activate five legendary creatures you control by tapping them, adding .
Activate Sisay by paying , searching your library for a legendary creature card with mana value less than Sisay's power and putting it onto the battlefield.
When the legendary creature enters the battlefield, Intruder Alarm triggers, untapping all creatures.
Repeat.

Emmara does not have summoning sickness.

Activate Emmara by tapping it, adding one mana of any color.
Emmara triggers, creating a 1/1 Human Warrior creature token.
The Human Warrior enters the battlefield, triggering Intruder Alarm, untapping all creatures.
Repeat.

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

Activate Magda by tapping it, adding .
Magda triggers, creating a Treasure token.
Activate Freed from the Real's second ability by paying , untapping Magda.
Repeat for infinite Treasure tokens.
Once you have infinite Treasure tokens, you can use them to activate Magda's ability to put all artifacts and Dragons in your library onto the battlefield.

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

Activate Magda by tapping it, adding .
Magda triggers, creating a Treasure token.
Activate Pemmin's Aura's first ability by paying , untapping Magda.
Repeat for infinite Treasure tokens.
Once you have infinite Treasure tokens, you can use them to activate Magda's ability to put all artifacts and Dragons in your library onto the battlefield.

King Macar does not have summoning sickness.
Freed from the Real attached to King Macar.

Activate King Macar by tapping it, adding .
Activate Freed from the Real's second ability by paying , untapping King Macar.
King Macar triggers, exiling target creature and creating a Gold artifact token.
Repeat.
You may also repeat this combo whenever a creature enters the battlefield under an opponent's control.

King Macar does not have summoning sickness.
Pemmin's Aura attached to King Macar.

Activate King Macar by tapping it, adding .
Activate Pemmin's Aura's first ability by paying , untapping King Macar.
King Macar triggers, exiling target creature and creating a Gold artifact token.
Repeat.
You may also repeat this combo whenever a creature enters the battlefield under an opponent's control.

Grimgrin does not have summoning sickness.

Activate Grimgrin by tapping it, adding .
Activate Grimgrin by sacrificing Gravecrawler, untapping Grimgrin and putting a +1/+1 counter on it.
Cast Gravecrawler from your graveyard by paying .
Repeat.

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

Cast Selective Memory by paying , exiling all creature and planeswalker cards from your library.
At the beginning of your next upkeep, The Prismatic Bridge triggers.
In response, activate Timestream Navigator by tapping it, paying , and putting it on the bottom of your library, taking an extra turn after this one.
Resolve The Prismatic Bridge's trigger, revealing cards from the top of your library until it reveals Timestream Navigator and puts it onto the battlefield.
Repeat from step 2.

Timestream Navigator may instead start in your library. In this case, do not exile it with Selective Memory, and The Prismatic Bridge will find it. This version of the combo takes an extra turn unless you have a way to grant Timestream Navigator haste.

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

Activate Grimgrin by tapping it, adding .
Activate Grimgrin by sacrificing a creature, untapping Grimgrin and putting a +1/+1 counter on it.
Animation Module triggers, causing you to pay to create a 1/1 Servo artifact creature token.
Repeat.