Mayhem Tyrant

Mayhem Tyrant cannot be countered.
Deathtouch.
Whenever a creature an opponent controls is put
into a graveyard from the battlefield, put a +1/+1
counter onto Mayhem Tyrant, then place X
-1/-1 Counters onto another creature, where
X is the number of +1/+1 counters on Mayhem
Tyrant.