Polymorph any Object is allowed actually but you cannot use it change your unique devil/demon appearance.<br/><br/>But I can allow swap for that Mirror Walk spell, altough considering it's drawback which conjures a clone of you who seeks to try kill you and take over your life means = a good version of you is seeking destroy you and become unique celestial entity :P.<br/><br/>Anyways Studmuffing summon ability can be in place or he can summon elementals (or water/ice aspected devils).