Zaffai and the Tempests is a rare Legendary Creature — Human Bard Sorcerer card from Secrets of Strixhaven Promos (PSOS), collector number 246p. Current market price: $0.33 (foil $1.59), TCGplayer market prices via Scryfall.
Once during each of your turns, you may cast an instant or sorcery spell from your hand without paying its mana cost.