Spectacular Skywhale is a uncommon Creature — Elemental Whale card from Secrets of Strixhaven (SOS), collector number 229. Current market price: $0.16 (foil $0.21), TCGplayer market prices via Scryfall.
Flying Opus — Whenever you cast an instant or sorcery spell, this creature gets +3/+0 until end of turn. If five or more mana was spent to cast that spell, put three +1/+1 counters on this creature instead.