Kayn from Teamfight Tactics Set #11

Ability

Shadow Assassin

On first cast, transform, dealing @TotalTransformDamage@ (%i:scaleAD%) physical damage to nearby enemies. While transformed, gain @CritChance*100@% Critical Strike Chance and critical attacks damage adjacent enemies. If the spin only hits one enemy, the damage is increased by @SingleTargetDamageAmp*100@%.

Subsequent casts deal @TotalSwipeDamage@ (%i:scaleAD%) physical damage to units in a line through the target instead.