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Fool's opportunity
rogue attack 13

Requirement: wielding a light blade

Target: one creature

Attack: Dexterity vs. Will[PH:122]

Effect: "The target takes damage as if it were hit by its own melee basic attack. If you have combat advantage against the target, you can add your Sneak Attack damage. The target hits itself with its melee basic attack. (If you have combat advantage against the target and your Sneak Attack isn't expended, you can use Sneak Attack against the target.)"[U :9/2011]

Fool's opportunity is an encounter power available to rogues at 13th level.