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Fox's gambit
rogue attack 1

Prerequisite: Acrobatics trained

Requirement: wielding a light blade

Target: one creature

Attack: Dexterity vs. Reflex

Hit: "1[W] + Dexterity modifier, and you negate any marks the target has applied. The target cannot mark any targets until the end of your next turn."

Effect: "You can shift 1 square.
"Artful Dodger: You can instead shift a number of squares equal to your Dexterity modifier."[MP:73]

Fox's gambit is an encounter power available to rogues at 1st level.