Spectacular Skywhale [Secrets of Strixhaven]

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. Rootha was humbled in the whale’s presence. It was glorious and beautiful, all on its own terms.