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Rogue's recovery
rogue attack 9

Requirement: wielding a crossbow, a light blade, or a sling.

Target: one creature

Attack: Dexterity vs. AC

Hit: "2[W] + Dexterity modifier damage."

Effect: if you have used all your encounter attack powers, you regain the use of a rogue encounter attack power you have used during this encounter. Or if you have combat advantage against the target, you can instead deal 2[W] extra damage with the attack.[MP:79]

Rogue's recovery is a daily power available to rogues at 9th level.