Ambush Commander
Duel Decks Anthology: Elves vs. Goblins — rare
Creature — Elf
Ambush Commander rulings:
2008-08-01: 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.