Чары
Когда оппонент играет заклинание существа, если Опаловый Страж является чарами, Опаловый страж Становится существом 3/4 Гаргулия с полетом и защитой от красного.
A noncreature permanent that turns into a creature can attack, and its
abilities can be activated, only if its controller has continuously controlled that permanent since the beginning of their most recent turn. It doesn't matter how long the permanent has been a creature.