ou yezi, master swordmaker

whenever ou yezi, master swordmaker enters the battlefield create legendary equipment named Chunjun if there is already legendary equipment named Chunjun instead create legendary equipment named Zhanlu. repeat this process for legendary equipment named: Haocao, yuchang, Juque, Shengxie, Longyuan, tai'e and Gongbu.
you may cast equipment spells and mana abilities without paying its mana cost