Contrary to what some may think, Mutations are not a combination of the First and Second Mind, instead they are both completely independent when Mutating.
The First and Second Mind will be able to Mutate (God Mutation status is discontinued), while the Third Mind cannot Mutate at all. If the player wishes so, they may choose to not Mutate their Magic to learn additional moves for their Source Magic.
Shatter, Equinox, and Flash are confirmed discontinued Mutations.
Verdies, Angry Pirate Captain - Plasma Magic
Theos, The War Phoenix - Sun Magic and Phoenix Magic