What role does magic play in the powers of villains like Circe and Zatanna when they choose to act maliciously?

Both Circe and Zatanna are incredibly powerful magic users. Circe specializes in transformation magic, often turning heroes into animals or manipulating their forms. Her magic is ancient and rooted in Greek mythology. Zatanna, while typically a hero, can wield incredibly potent spells when villainous, often speaking backwards to cast them. Both rely on incantations and mystical energy, but Circe's is more focused on alteration, while Zatanna's is broader in scope.