Blood Surge Titan

Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block
as long as it has a +1/+1 counter on it.)
Whenever Blood Surge Titan enters the battlefield or attacks, put two -1/-1 counters on target creature, if you do, put two +1/+1 counters on Blood Surge Titan.