Consuming Aberration is a rare Creature — Horror card from GRN Guild Kit (GK1), collector number 10. Current market price: $0.34, TCGplayer market prices via Scryfall.
Consuming Aberration's power and toughness are each equal to the number of cards in your opponents' graveyards. Whenever you cast a spell, each opponent reveals cards from the top of their library until they reveal a land card, then puts those cards into their graveyard.