Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is my un-completed guide to Ez, which I made because someone asked for it.
You can basically lane anywhere.
Pros / Cons
Vulnerable to CC.
Hard to master.
Laning against Vlad at mid in the early game.
Stay away, if he uses his transfusion you could use your arcane shift and quickly shot mystic shot.
Basically stay away.
Since Ezreal is targeted first you'll need:
Ghost and Flash, so that you could get out of range as fast as possible.
Also if you're chased you could use them all three (Ghost - Arcane Shift - Essence Flux)