Gvar, Krumar Enforcer

Decay 4 (This creature enters the battlefield with four +1/+1 counters on it. Whenever this creature blocks or becomes blocked, remove a +1/+1 counter from it.)
Whenever one or more +1/+1 counters are removed from another creature, put that many +1/+1 counters on Gvar, Krumar Enforcer.