Skys: I tried not to push forward this archetype that much, since flying is already quite strong in this meta. Get your evasive creatures and pump them for the win. Aven Gagglemaster is a powerhouse in this deck's lategame.

ETB matters: Drafting creatures with strong enters the battlefield effects grants you tons of value while developing your board. Get some blink/flicker effects like Ephemerate and your resources will be game ending.

Tokens: What a fast archetype. You want to draft Moan of the Unhallowed, Battle Screech and any other token generator you put your hands on. Put some spot removals and lords on the mix and you are good to go.

Control: One of the three control archetypes, I have given BW control the only monarch card of the cube with Knights of the Black Rose. Removals and creatures such as Seeker of the Way will do the trick.

Dies Twice: In an attempt to bring a non-aggro strategy to the cube, found in Strixhaven an interesting alternative: leaving the graveyard matters. The idea is to get cards out of the graveyard for value. Pay attention to the many options present at the cube, like Oketra's Attendant and Magmatic Sinkhole. Virtual card advantage is this strategie's backbone.

Weenies: Small aggro decks are just amazing. Easy to build, hard to disrupt. Get as many bodies on the table as possible with Raise the alarm and friends, then pump your army with Goblin Bushwacker to bring the game to a quick end.

Counters: If you want to have the biggest creatures around, look no further. Using Curse of Predation at its finest, this archetype does a lot of damage in no time. And as if it was not enough, cards like Inspiring Call will greatly reward you for having counters on your creatures.

Pillowfort: Selesnya may not be commonly recognized as a control combination, but your opponents will see it as such. Getting together a cruel mix of walls, fogs, taxing and tap effects, they will be enough to paralyze any aggro deck. Of course, you should have problems facing sacrifice and control decks, since they don't care that much about your defenses, but those are less common here. Oh, and maybe its a good idea to have a wincon beyond enraging your opponent. Ironfoot warlord and Aerial Responder are great roadblocks and finishers.

Control: I know, I know. Baleful Strix is not a legend. But come on, can you say no to this adorable owl? I know I can't. Besides, Strix is legendary creature level anyway. Removals, counters, Ravenous Chupacabra and bombs at this color combination are your bread and butter to have the last of the three control archetypes of this cube.

Reanimator: Step 1: discard big dumb Ulamog's Crusher
Step 2: cast Exhume
Step 3: ?????
Step 4: Profit
Bear in mind that discard outlets such as Chemister's Insight and Rank Officer are very useful ways to get your threats to the yard. Self discarding creatures, like Striped Riverwinder are quite an asset too. Maybe your wincon can be your opponent's one though... I'm looking at you, Eldest Reborn and Extract from Darkness.

Wizards: This cube would not be complete if there wasn't a spells matters deck. Gather up burn spells (a certain Lightning Bolt is king here), cantrips (Ponder as much as you can), Monastery Swiftspear and other prowess creatures to get your opponent's life down to zero.

Ramp: You will be able to throw the strongest creatures of this cube at your opponent's face in no time. Also, this archetype is the only one where you can use the powerfull cascade ability. After Rampant Growth-ing into the sixth mana, nothing will stop you.

Sacrifice: Get your creatures to the dump for profit. The more expandable, the best. Add some strong recursion effects, like Victimize to make the party complete.

Midrange: Black and Red are equipped with so many efficient creatures and great removals it was imposible not to have this archetype. It is wise to steal Phyrexian Reclamation from its sacrifice counterpart to add even more value of your Flametongue Kavu.

Graveyard Matters: Another classic making it to the cube. Once again, black's efficiency creates another archetype. This time, you will be able to extract tons of value from yard, since it has the most efficient grave filling cards, such as Satyr Wayfinder. Play this as the old midrange BG Rock deck with strong grave synergies. This may not be the fastest deck, but surely is the most resilient.

Power 4 matters: GRUUL NOT GUILD!! GRULL ARCHETYPE!
Small aggressive creatures, burn spells, occasional pump and protection, turn everything sideways and crash through any defenses. This archetype is the best one to enable all the power 4 shenanigans. Do not underestimate an early Heir of the Wilds, it does serious damage and trades well in a long run.

I prefered not to let many combos in this cube. Generally, they are a bit frustrating to play against and hard to assemble while drafting. I decided to leave only three combos/interactions that are either loopable or game-ending if fully executed.

First, we have Flicker. It may be useful as a wincon for any blue deck and is also a fun challenge while drafting.
In case you don't know how it works:

1. Archaeomancer
2. Ghostly Flicker or Ephemerate
3. Any other creature with ETB effects (Forbidding Spirit, Mulldrifter...)

Also, Archaeomancer can soft lock your opponent with Familiar's Ruse.

Second, there is the interaction between Oketra's Monument and Kor Skyfisher. A lowered cost kor can bounce itself, leaving a warrior token at the process for only . Decks like Selesnya Pillowfort get this as a strong and hard-to-disrupt wincon.

I chose not to give much redundancy to those combos, so that they may not be easy to assemble.
There are many other combos that can easely be put into this cube. For example, Murderous Redcap and Kitchen Finks are game winnig with Good-Fortune Unicorn and a sac outlet.

The most exciting part of building a cube. CYCLES! I'll leave them all listed here just for notice.

Once in a while, I find some cards that besides being peasant legal, are just too strong. It would just not be fun to play some games that are purely decided by a single overwhelming card. This is not an extensive list, but here are some of the cards I let go due to their sheer power.
Hymn to Tourach
Sinkhole
High Tide
Force of Will
Gitaxian Probe
Daze
Gush
Wasteland
Ghostly Prision
Sol Ring
Fireblast
Skullclamp
Stonehorn Dignitary
Orzhov Advokist
Propaganda
Deathreap Ritual
Loxodon Warhammer