Master Yi idea - [E] Wuju Style / Wuju Dagger
This idea is generally based on the synchronization between Master Yi and Blade of the Ruined King as well as addressing the mobility creep for Master Yi as well as giving him escape and ganking options and rising his skill floor a little bit.
The old Wuju Style playstyle is being kept the way its being played but the suggested Active is a bit different and offer extra options on how to play Yi and when to use Wuju Style by choice
[E] Wuju Style / Wuju Dagger
Passive - Wuju Style: Grands 15% AD bonus true damage to Alpha Strike and each hit from Master Yi's basic attacks. After using Wuju Dagger this effect is doubled for 5 seconds after which Wuju Style bonus is lost until off cooldown
Active - Wuju Dagger (or Shattering Dagger) Range 700: Master Yi grabs one of his daggers on his boots which he throws at target direction dealing true damage to enemies on a line and grands a stack of Double Strike for each champion or monster hit by the dagger. Enemy champions hit by the dagger will reduce their armor by 15% for 5 seconds, their movement speed reduced and Master Yi's movement speed increased by 30% for 1.5 sec.
dagger's true damage: 30 / 60 / 90 / 120 / 150 + 90% bn AD
To address Master Yi's mobility Creep if the Dagger hits enemy champions those champions will have their movement speed reduced while increasing Yi's movement speed for very short time and since it's a skillshot that means Yi can miss or his opponents can dodge the Dagger thus not get those bonuses
Additionally Wuju Style damage is split between Wuju Style and Wuju Dagger so the dagger would kinda plays important role here and becomes great utility for Yi both damage and non-damage way. As damage it reduces enemies champions armor a bit, but if the dagger misses then it will not apply the armor reduction and Yi would deal less damage along side that the dagger did not do it's own damage. Non-damage way it slow down enemy champions while giving Master Yi movement speed for short time
Laning as Master Yi if you see the enemy jungler ganking you then you can just use the Wuju Dagger and if it hits your laning opponent and/or the enemy jungler it will slow them down while boosting Yi's movement speed giving him escape option. In addition Wuju Style and Wuju Dagger is purely true damage and with the combination of armor reduction on enemy champion it will make taking down tanks easier. Reducing enemy champion's armor and slowing them down will allow Yi to set up successful ganks for his jungler
As a jungler Master Yi's ganks would be more reliable since if Wuju Dagger hits his opponents it slows them and shatters their armor giving utility for himself and his team for more more successful takedown on the important targets in hit by the dagger.
For lategame teamfights since Wuju Style and Wuju Dagger does only true damage and armor reduction while slowing enemy champions down will give Yi's team the utility to take down the front line in case the back line is not available or pick off any important target that is out of position