Bloodletter of Aclazotz is a mythic Creature — Vampire Demon card from The Lost Caverns of Ixalan (LCI), collector number 92. Current market price: $35.06 (foil $39.83), TCGplayer market prices via Scryfall.
Flying If an opponent would lose life during your turn, they lose twice that much life instead. (Damage causes loss of life.)