Alara set-themed cube!

Opting to slightly break peasant rules, we're including some rare lands. Pushing 3-color decks always has tension, but wanting semi-aggro to be viable, you've gotta make some concessions.

Bant: Party (creatures of the types in all colors, but the payoffs and largest supporting creaturebase means those decks start here)
Esper: Artifacts (fairly straightforward)
Grixis: Yard matters (creatures and spells, lots of things that want cards in / play with the graveyard)
Jund: Sacrifice, counters, a bit of bleed-over from Naya big-bodies
Naya: Big creatures, some of Bant's party payoffs and a lot of warriors