Voracious Vermin

This creature can't block.

Whenever this creature or another Ally you control enters, you may put a +1/+1 counter on this creature.

Whenever another creature you control dies, put a +1/+1 counter on this creature.

When this creature enters, create a Food token. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")

Whenever you sacrifice a Food, create a 1/1 black Rat creature token with "This token can't block."

Whenever this creature or another nontoken Zombie you control dies, create a 2/2 black Zombie creature token.

Whenever another Rat you control enters, exile up to one target card from an opponent's graveyard.

At the beginning of combat on your turn, create a 1/1 black Rat creature token with "This token can't block."

Whenever this creature enters or attacks, put a -1/-1 counter on up to one target creature.

Creatures your opponents control with -1/-1 counters on them can't block.