Opal Avenger | Magic: The Gathering
Formats Opal Avenger is Legal in
Official Oracle Text for Opal Avenger
Official Rulings for Opal Avenger
8/1/2008 : 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 his or her most recent turn. It doesn't matter how long the permanent has been a creature.