Shuffle is an Armor ability, found in the Medium Armor Skill Line.

Shuffle
2943 Instant Cast Target: Self Base Skill: Evasion
REQUIRES 5 PIECES OF MEDIUM ARMOR EQUIPPED Shroud yourself in mist to gain Major Evasion, decreasing damage from area attacks by 20% for 20 seconds. Each piece of Medium Armor worn removes and grants immunity to snares and immobilizations for 1 second.

Shuffle is a morph of the Evasion base skill. The other morph is Elude.