Mavren Fein, Dusk Apostle is a rare Legendary Creature — Vampire Cleric card from Ixalan Promos (PXLN), collector number 24p. Current market price: $3.45 (foil $4.99), TCGplayer market prices via Scryfall.
Whenever one or more nontoken Vampires you control attack, create a 1/1 white Vampire creature token with lifelink.