Flashy riposte
rogue attack 5
Melee weapon
Requirement: wielding a light blade
Trigger: an enemy makes a melee attack against you
Target: the triggering enemy
Attack: Dexterity vs. AC
Hit: "2[W] + Dexterity modifier damage."
Effect: "The target grants combat advantage to you and your allies until the end of your next turn."[MP:76]
Flashy riposte is a daily power available to rogues at 5th level.