Sistheirmin, the Corrupter

Infect
whenever a -1/-1 counter is put on a creature, put
2 +1/+1 counters on Sistheirmin, the Corruptor
whenever a creature you control dies, create
X 3/2 black green plant zombie creature tokens with infect, where X
is the amount of +1/+1 counters on Sistheirmin, the Corruptor