An idea to improve Shen's kit and make him feel more ninja
Why don't you change the floating sword to a shadow holding the sword? I mean, when you activate your W Shen's shadow takes the sword and thrusts it into the ground. Also give Shen's shadow the capability to attack a nearby unit each 10 seconds (or more). The shadow couldn't be able to autoattack when the W is active. If you want, reduce the damage from the shadow to keep it healthy so it only be a little help when dueling. 