The One Zed Nerf To Rule Them All...
...Is actually a reversion. When Zed was released, his ultimate would put Zed in front of his target and would place a shadow behind his target, allowing him to flip to the side opposite his opponent to yield better chasing potential in the case of a dash. Right now, Zed basically gets an infinite distance escape after gibbing his target but if you were to revert the mechanics of his ultimate back to what it was at release, you would effectively make Zed always have to commit to his target. This way, if Zed intends on killing you, while he might once more have a few more options in doing so he at least always has to fully commit to the engage without simply disappearing at the click of a button.