Relentless Skaabs

Relentless Skaabs

Creature - Zombie | Power/Toughness: 4 / 4 (CMC 5)
As an additional cost to cast this spell, exile a creature card from your graveyard.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)