Hi yall, this is a build for a purely AP Ezreal. I realize most Ez players prefer AD over AP, or a hybrid version, but I've played versions of all three and have had the most success with this form. Seeing as how there weren't many AP Ez guides out there that were very current, I figured I'd throw one on here. This is my first build, so be gentle :)

Pros
-MASSIVE aoe damage mid and late game
-mobile with a reliable escape (essentially a free flash)
-long range sniping
-easily turn the tide in team fights; game-changer
-large burst damage output

Cons
-squishy
-semi-weak early
-all skill shots! difficult to master for some
-mana-hungry early when going AP

MARKS

- I am using Magic Pen Marks to get through enemy MR. trust me if you play this right, you will have enemies stacking MR quickly.

SEALS

- I prefer flat AP Seals to AP per level, as the most trouble Ez has is early game. This allows his attacks to be much more threatening early on, especially his Essence Flux, and helps in lane. Late game you will have enough ap that it won't matter much which runes you take.

Glyphs

- I'm also taking flat CD reduction glyphs for the same reason as the seals. The bonus is especially nice early on to spam skills, and once you have a tear of the goddess, you can spam without mana issues.

Quints

- You can go a few different ways with your quints. Some like move speed or health for utility, but I like going AP here too. I personally like the large blasts of AP damage early on to really scare enemies out of xp range in lane. Again this is my own preference. Quints are expensive; I say use what you like here.

Masteries I put a heavy focus into utility. The cooldown reduction, extra experience gain, and mana boosts are essential for effective ap play.

Ok I decided to change the items around since publishing this build previously. I have added mejai's soulstealer and hextech revolver, which allows for both exponentially increasing damage and healing. This will increase your damage output significantly, especially if you have about 10 stacks by the time you buy your rabadon's deathcap. This should jump your ap up to where one ult into a team fight can realistically take 50% health away from EVERY enemy it hits.

I think with the skill sequence that the best way to proceed is rushing Essence Flux. Combined with the flat ap runes and ignite, it can lead to some early kills and strong ganks. After that the next focus should be Arcane Shift and then lastly Mystic Shot.

Hope you guys like the build! I would love any comments and criticism to help make this build better. Thanks and enjoy!

*Also please comment when you vote so I can get some feedback on ways I may improve. thanks!