Encantamiento
Cuando un oponente juegue un hechizo de criatura, si el Guardián de ópalo es un encantamiento, el Guardián de ópalo se convierte en una criatura Gárgola 3/4 con la habilidad de volar y protección contra rojo.
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.