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 build for Ezreal. I had a nice long guide, but I posted it as a guest and can't find it now to copy-paste (I checked the hidden button). Anyway, this build focuses on armor penetration, using mystic shot to 4 shot squishies. The newest patch made AD ez really strong. Main thing is to get brutalizer and madred's razor asap, then free to choose a boot and finish ghostblade. Games usually over soon after you finish the bloodthirster, for tankish groups you are able upgrade the madred's razor. Practice mystic shot and kiting, use shift to both gain and close distance and set up mystics. Arcane shift through walls, this is one of your best kiting techniques. Clairity almost allows mystic spamming, but try to keep arcane shifts to a minimum. Cleanse is just awesome, saved me to many times to ignore. Short and sweet, this works really well both farming and champion kills. Enjoy.