The Wind Crystal is a rare Legendary Artifact card from Final Fantasy (FIN), collector number 330. Current market price: $14.11 (foil $16.10), 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.