This cube is meant for new-ish players. The mechanics are limited in complexity and the available deck themes should be fairly obvious.
I wanted to add a little replay-ability and force some non-trivial drafting decisions by having some of the better cards fit into multiple archetypes and therefore be sought by multiple players at the table. It’s no fun when most powerful cards are only needed by one player who will get them without compromise.
Some tribes:
Merfolk (U/G) - +1/+1
Wizards (U/R/B) - spells / looting
Elves (G,+) - ramp
Soldiers (W) - aggro
Humans (W) - aggro
Clerics (B/W) - life gain
Vampires (B/W) - life gain
Temur mana creatures (G/B/R)