Hidden Predators | Magic: The Gathering
Formats Hidden Predators is Legal in
Official Oracle Text for Hidden Predators
Official Rulings for Hidden Predators
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.