Clavileno, First of the Blessed (Display Commander) - Thick Stock (LCC-122) - The Lost Caverns of Ixalan Commander Foil

Whenever you attack, target attacking Vampire that isn't a Demon becomes a Demon in addition to its other types. It gains "When this creature dies, draw a card and create a tapped 4/3 white and black Vampire Demon creature token with flying."