Capricious Hellraiser is a mythic Creature — Phyrexian Dragon card from Phyrexia: All Will Be One Promos (PONE), collector number 125p. Current market price: $0.44 (foil $0.79), TCGplayer market prices via Scryfall.
This spell costs {3} less to cast if you have nine or more cards in your graveyard. Flying When this creature enters, exile three cards at random from your graveyard. Choose a noncreature, nonland card from among them and copy it. You may cast the copy without paying its mana cost.