Mavren Fein, Dusk Apostle is a rare Legendary Creature — Vampire Cleric card from Ixalan (XLN), collector number 24. Current market price: $1.37 (foil $2.88), TCGplayer market prices via Scryfall.
Whenever one or more nontoken Vampires you control attack, create a 1/1 white Vampire creature token with lifelink.