AD Ez gets incentive to use E aggresively...
But only when 1 - There are no minions 2 - An Enemy with lots of mobility is across the map 3 - No jungle camp in the way
I'm sure there are a lot of other things that could obstruct an Ez's E. I just want to say that E hitting only champs would make the spell a lot better in the process.
If Arcane Shift is supposed to be an All-In type deal, then it would be nice to have it only target champs (Or prioritize at least). Ez has pretty meh wave clear, and the amount of times that little bolt thingy just flies off to the side to hit a minion is aggravating.
And this would fit nicely onto AP Ez seeing how it is a good chunk to his combo too.