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.
Let me start by saying this, i have tried Ezreal every way possible and AP Ezreal with offensive masteries is far superior than any other form of Ezreal.
You start off by buying a meki pendant and 2x health potions.
On Next recall i try to purchase a tear of goddess and basic boots.
After that i buy a necessary item for ap ezreal, the feared mejai's soulstealer.
Next it is the most important reason ap ezreal is far superior than ad ezreal, LICHBANE!
From here u should be stacking the $hit out of mejai's and u should be half healthing anything that comes in your essence flux.
I usually try to grab archangel's and then move on to my zhonya's.
If the game is still going buy a lichbane and enjoy the pain u inflict.
I will update as they continue to nerf ezreal until he useless, and i will continue to update the build and description the more experienced a become with ezreal.
i hope i have influenced a few with this ap ezreal build, and i hope to see u on the field :)