Defiler of Dreams is a rare Creature — Phyrexian Sphinx card from Dominaria United Promos (PDMU), collector number 46p. Current market price: $0.59 (foil $0.75), TCGplayer market prices via Scryfall.
Flying As an additional cost to cast blue permanent spells, you may pay 2 life. Those spells cost {U} less to cast if you paid life this way. This effect reduces only the amount of blue mana you pay. Whenever you cast a blue permanent spell, draw a card.