Brukai, the Restless Scourge

Flying, Trample, Haste
Decay (At the beginning or your upkeep, put a -1/-1 counter on this creature)
Whenever a Zombie without a +1/+1 you control would die, you may tap another untapped Zombie you control, if you do, return it to the battlefield tapped with a +1/+1 counter on it.