Galazeth Prismari is a mythic Legendary Creature — Elder Dragon card from Strixhaven: School of Mages (STX), collector number 281. Current market price: $3.52 (foil $13.98), 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."