Creature - Gargoyle 3/4, 3W (4) Defender (This creature can't attack.) Flying {1}{W}: Creatures you control with defender can attack this turn as though they didn't have defender.1 Its pulsating cry shatters bonds of iron, granite, and servitude.
Illus. Jim Murray
The ability's effect changes the rules for declaring attackers this turn, so it doesn't just apply to creatures in play when it resolves. [Dissension FAQ 2006/04/13]