Troglodyte

Whenever a nontoken creature dies, put a +1/+1 counter on Troglodyte.
Whenever Troglodyte deals combat damage, put a +1/+1 counter on it.
Remove a +1/+1 counter from Troglodyte. Each opponent loses 1 life and you gain 1 life.
Cunning, and voracious to the core.