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-UE
Comments
White-Blue - Birbs - Flying
White-Black - Bats - Life gain/loss
White-Red - Mice - Valiant (abilities that trigger the first time you target that creature each turn) and lots of attacking
White-Green - Rabbits - Go wide
Blue-Black - Rats - Thereshold (Having 7 or more cards in your graveyard)
Blue-Red - Otters - Non-creature spells.
Blue-Green - Frogs - Returning your permanents to your hand
Black-Red - Lizards - Abilities that care if an opponent has been dealt damage that turn (you'd think they'd bring back Bloodthirst for it, but I suppose the name doesn't fit the flavor) (Edit: Although I see now that they'd have to have some life loss effects to cause damage instead so as to preserve some synergies.)
Black-Green - Squirrels - Food and self-mill
Red-Green - Raccoons - Expend 4 (spending 4 mana per turn) and lots of attacking.
So I drafted Premier Draft twice (edit: on a Bronze account) and... that was disastrous, 1-3 for both, one with a white-green deck I thought was pretty good, and a white-black deck I knew was awful.