Nerf Zed by giving his ult a bit more counterplay
It's a simple nerf really, add clarity for the poor squishy about to be assassinated so that they know which direction their death is coming from.
Add a shadow poof visual effect to indicate where the untargetable Zed is about to reappear. It would give players (particularly newer ones) quick visual feedback that can help them plot their next move (such as Lux binding you under the turret that you shouldn't have dove at &<10% health). I, as a more experienced player, know that he always appears on the opposite side of me. This isn't readily apparent to new players, and I highly suspect that even some older players may not know this. This change would help players, particularly newer ones, know that Zed will appear behind them which would establish a fair point of counter play against an incredibly powerful spell.
This can also help out players that are new to Zed, giving them visual feedback to go "Oh okay, I'm appearing on the opposite side of this champion".
If it's impactful enough, they may even be able to revert some of the timing nerfs on Zed jumping back to his ultimate shadow.
I threw together a qucik Gif demonstrating the concept with my amazing flash skills by adding a shadow VFX where Zed appears: http://i.imgur.com/AwKYGLr.gifv
For the record: That Lux was a beginner bot, otherwise I would have been very dead.
