Cemetery Prowler is a mythic Creature — Wolf card from Innistrad: Crimson Vow (VOW), collector number 191. Current market price: $5.78 (foil $6.00), TCGplayer market prices via Scryfall.
Vigilance Whenever this creature enters or attacks, exile a card from a graveyard. Spells you cast cost {1} less to cast for each card type they share with cards exiled with this creature.