Ooh ARR, it's Barnyard Cube!
This is a more focused version, with less tribes but more synergy.

NOTE: Aiming to have 100 cards per colour (more for green?)

Tribes + Playstyles:
Cats (G/W) - Lifegain
Dogs (R/B/W) - Aggro
Birds (U/W) - Flyers
Boars (G/R) - Big Bois and Big Damage
Frogs (U/G/B) - Lands
Rats (B/R) - Discard
Scarecrows (5 Colour) - Artifacts

Maybe Tribes:
Ox, Snake, Horse, Fox, Humans