Flesheating Cannibal

Gluttonous (Whenever a creature dealt damage by this creature this turn dies, put a +1/+1 counter on this.)
Delirium - If there are four or more card types among cards in your graveyard, Flesheating Cannibal gains deathtouch and attacks each turn
if able.
The smell of dying creatures makes it even more hungry for warm meat, than it is anyway.