Nazeebo

Wither. Whenever a creature an opponent
controls dies, if it had a -1/-1 counter on it, put
a +1/+1 counter on Nazeebo.
3 XP: Say the magic words, {3}{g}, {t}: Nazeebo
deals 1 damage to target creature an opponent controls. This ability costs {2} less to activate as
long as the target has a -1/-1 counter on it.
7 XP: {5}{g}, {t}: Create a blue and black Gary,
the Gargantuan creature token. (Only one Gary.)
10 XP: Whenever Nazeebo attacks, proliferate.
I have a PHD in PVP.