Relentless Skaabs is a uncommon Creature — Zombie card from Duel Decks: Blessed vs. Cursed (DDQ), collector number 46. Current market price: $0.10, TCGplayer market prices via Scryfall.
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.)