Demonizing Pit

Whenever a 4/4 Black Zombie creature you
control dies, create a 5/5 Black Zombie Demon creature token with, Whenever this creature kills another creature, put a +1/+1 counter onto this creature.
During each upkeep, if a creature you control
with a +1/+1 counter on it was damaged by a
non-creature source, remove a +1/+1 counter
from it.