Or make it a targeted skill that has a radial explosion to make his laning better.
Why do I want it something else? Because honestly - he is better in the jungle and the E is pretty worthless, and in massive teamfights it's barely noticeable.
It makes him stop moving for a moment to throw out a line "nuke" that does pathetic damage, is slow and has a barely noticeable heal (that requires you to attack or Crystal Slash the things that you hit with it).
It makes absolutely zero sense in his kit. Q slows and has a low CD for his passive, W increases his MS and AS (benefitting Q, and passive) and his ult pulls people around (again W helps this, Q does too and it benefits from q and his passive). His E feels tacked on.
Not to mention that nobody grabs it ever.
I seem to remember that Riot wants every skill to be WANTED before level 13 (I can't remember which rework it was - but they specifically stated that they didnt like how that champion only grabbed points in two abilities and nobody even noticed the third). The shield on W increases his sustain; and the heal on E is cumbersome and pushes a lane needlessly, or slows you - which decreases his ganking effectiveness.
I honestly think it should be a skill that can proc Crystal slash (IE: Not having to Crystal Slash twice just to get the slow). This would make people more likely to grab it, but also streamline his kit so all the skills mesh together.
Feel free to offer other ideas. I'm tempted to make a post on the GD forums about this because it's something that's bothered me since his release.