TFT Set 18.1
Master Yi, a 3-cost Adaptor unit in TFT Set 18

Master Yi

3 Attack Specialist 
Wuju Style
Passive: Every third attack is a Double Strike. On takedown, gain a burst of movement speed.

Adaptor Attack Damage: Double Strikes grant 15% Ability Power stacking Attack Speed.

Adaptor Ability Power: Double Strikes deal bonus damage and heal.
Attack Speed
15 Ability Power

Traits

  • Adaptor 
    Innate: Adaptor abilities change depending on if their Attack Damage or Ability Power is higher.

Adaptors gain Ability Power or Attack Damage, depending on which is higher.
  • Blossom 
    After combat, your Wisps are empowered. 

Blossom champions gain Attack Damage, Ability Power, and 10% max Health.

Master Yi enables

  • Heal

    Restores Health to a unit, capped at maximum HP.

  • Attack Speed

    Bonus Attack Speed makes a unit attack more often per second, which means more auto-attack damage and faster mana generation toward the next ability cast. Some carries scale beyond that — their ability itself fires more hits when they have more Attack Speed (e.g., the number of swipes in Aphelios's onslaught). Stacking AS items and traits on these units compounds: faster autos, faster casts, and bigger casts.

Master Yi benefits from

  • On Takedown

    Effect fires when a unit secures a kill or assist. An assist counts, so a unit that only contributed damage still triggers it.

Master Yi scales with

  • Stacking In Combat

    The carrier ramps power within a single round — Titan's Resolve gains AD/AP per attack or hit taken, and the Rapidfire trait builds stacking Attack Speed on every attack, up to a cap. All in-combat stacks reset when the round ends, unlike takedown-stacking which carries across rounds.