The Wind Crystal is a rare Legendary Artifact card from Final Fantasy Promos (PFIN), collector number 43s. Current market price: — (foil $15.15), TCGplayer market prices via Scryfall.
White spells you cast cost {1} less to cast. If you would gain life, you gain twice that much life instead. {4}{W}{W}, {T}: Creatures you control gain flying and lifelink until end of turn.