Rot Harvester

Menace
Whenever another creature with one or more
-1/-1 counters on it dies, put a +1/+1 counter
on Rot Harvester.
Delirium - {2}{b}{g}: Put a -1/-1 counter on target creature. Activate only if there are four or more
card types among cards in your graveyard.
On Innistrad, the horrors never cease.