Whenever a player sacrifices a creature, you may put a +1/+1 counter on this creature.

Menace Whenever this creature attacks, each opponent loses X life and you gain X life, where X is the number of other Squirrels, Bats, Lizards, and Rats you control.

Menace Other Squirrels you control have menace. Whenever you sacrifice one or more Foods, create a 1/1 green Squirrel creature token. {2}, Forage: Put a +1/+1 counter on each other Squirrel you control. (To forage, exile three cards from your graveyard or sacrifice a Food.)

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.) If one or more tokens would be created under your control, those tokens plus that many 1/1 green Squirrel creature tokens are created instead. {B}, Sacrifice X Squirrels: Target creature gets +X/-X until end of turn.

(Gain the next level as a sorcery to add its ability.) Whenever one or more creatures you control die, create a Food token. This ability triggers only once each turn. {1}{B}: Level 2 Whenever you sacrifice a permanent, target player mills two cards. {2}{B}: Level 3 At the beginning of your end step, you may sacrifice three other nonland permanents. If you do, return a creature card from your graveyard to the battlefield with a finality counter on it.