Vampire Crypt Lurker

When Vampire Crypt Lurker enters, create a Blood token. (It’s an artifact with "{1}, {t}, Discard a card, Sacrifice this artifact: Draw a card.”)

{t}, Sacrifice Vampire Crypt Lurker: Target creature gets -X/-X until end of turn, where X is twice the number of Blood tokens you control. Activate only as a sorcery.