Cemetery Gatekeeper is a mythic Creature — Vampire card from Innistrad: Crimson Vow Promos (PVOW), collector number 148p. Current market price: $3.26 (foil $3.99), TCGplayer market prices via Scryfall.
First strike When this creature enters, exile a card from a graveyard. Whenever a player plays a land or casts a spell, if it shares a card type with the exiled card, this creature deals 2 damage to that player.