Mavren Fein, Dusk Apostle is a rare Legendary Creature — Vampire Cleric card from The Lost Caverns of Ixalan Commander (LCC), collector number 133. Current market price: $0.32, TCGplayer market prices via Scryfall.
Whenever one or more nontoken Vampires you control attack, create a 1/1 white Vampire creature token with lifelink.