Bard Utility 2Concerted Effort
Your magic hums around your allies, growing in power as they redouble their efforts toward the task at hand.
Standard Action Close burst 10
Target: You and each ally in the burst
Effect: Until the end of your next turn, each target gains a +1 power bonus to attack rolls. Whenever a target hits with at least one attack during his or her turn, the bonus increases by 1 for each target whose turn has not yet started.
Published in Arcane Power, page(s) 8.