In Magism, the yazatas collectively are the good powers under the Shah, who is the greatest of the yazatas under Zurvan.
In Mushrikism, the yazatas collectively are the good powers under like Ahura Mazda, who is "the greatest of the yazatas" are all equal against his their co-eternal opponent opponents like Ahriman.
In Hanifism, the yazatas collectively are the good powers under Melek Taus who is is the greatest of the yazatas under Zurvan.