Artifact, 3 (3) Creatures with power greater than the number of cards in your hand can't attack. Bridges usually get you from one place to another. This one just gets you.
Illus. Ron Spencer
It only checks the cards in your hand when declaring attackers. Once they are declared, changes to your hand size or to the power of the creatures will not remove creatures from the attack. [Duelist Magazine #25, Page 30]
All creatures in play (including yours) are subject to the restriction based on the number of cards in your hand. [D'Angelo 1998/07/22]