Maestros Diabolist is a rare Creature — Vampire Warrior card from Streets of New Capenna (SNC), collector number 318. Current market price: $0.22 (foil $0.56), TCGplayer market prices via Scryfall.
Deathtouch, haste Whenever this creature attacks, if you don't control a Devil token, create a tapped and attacking 1/1 red Devil creature token with "When this token dies, it deals 1 damage to any target."