Entrails Feaster is a rare Creature — Zombie Cat card from Onslaught (ONS), collector number 143. Current market price: $0.45 (foil $8.53), TCGplayer market prices via Scryfall.
At the beginning of your upkeep, you may exile a creature card from a graveyard. If you do, put a +1/+1 counter on this creature. If you don't, tap this creature.