I like tribal, as anyone who's seen me play on Untap.in will attest. So I made a tribal cube to figure out how cube drafting/building works.

Each creature tribe will get 8 cards to specifically aid them, and 15 other in-tribe cards that are generally good and synergistic with their tribe. Each class tribe will get 5 support cards, and 10 cards of that tribe. Note that there will be some overlap, but each will only count towards 1 tribe (i.e, Brighthearth Banneret will only be counted for Warriors, though it boosts Elementals). There will also be 10 changelings and the like, 15 cards that reward playing tribal and 6 cards that can be tuned for any tribe!

TRIBES: Goblins (Well, it was inevitable.) Elves

Will finish later. :)