Galazeth Prismari is a mythic Legendary Creature — Elder Dragon card from Strixhaven: School of Mages Promos (PSTX), collector number 189s. Current market price: — (foil $8.92), TCGplayer market prices via Scryfall.
Flying When Galazeth Prismari enters, create a Treasure token. Artifacts you control have "{T}: Add one mana of any color. Spend this mana only to cast an instant or sorcery spell."