Henry, Twisted Mind

Wither.
When a creature an opponent controls dies, if
Henry, Twisted Mind has dealt damage to that creature this turn, put an amount of +1/+1
counters on Henry, Twisted Mind equal to the
amount of -1/-1 counters on the dead creature.
"Dead things! I love dead things! Especially when I
get to kill them again. That's a very special experience.
Ooh! After I kill you, do you think you could get back
up again? Pleeease?!"