Grotesque Mutants

Whenever a creature dies, put a +1/+1 counter on Grotesque Mutant and it gains all abilities of the creature that died until end of turn.
{b}{b}{g}{g}, {t}, Remove a +1/+1 counter from Grotesque Mutant: Return target creature from your graveyard to the battlefield tapped with a
-1/-1 counter on it.
Some things are too disgusting to unsee...