i play Ez as an AD champ cus i thinks its the most effective.
i normaly go for mid but if u wanna lane whit someon its best if its a pre-mate cus ez is very weak. strong on long combat but in close he only have 1 spell to get away (Arcane Shift)
but enyways wen playing Ezreal its best to have just a little AP not full AD.
Hes Ultimate is most increased by AP so u will need to get just a little of that as u see in the build.

Wen u play him make sure that u allways hit ur enemy so ur CD will go lower evry time u hit whit Mystic-Shot (that will make it easy´r for u in close combat if u can shoot ur spells all the time)

In team fight´s allways find a place were u can cast ur spells un-intterubtet F.eks behind a wall or ofc BEHIND ur team.
U can go watch Ezreal champion spotlight u might find some usefull tips there (you can ofc find it on youtube).
Wen ganking u should try hit whit all ur spells bafore entering battle F.eks from a brush or behind a wall and fire ur ultimate bafore facing ur enemy... unless u want to last-hit ur target in combat.
This is how i play him and i hope it will work for u too.
B.T.W. plz dont dislike if u havent tryed it ingame.... ofc if u try it and u dont like it its okay to dislike..

TY.

I play whit flat Dmg runes and armor pentration runes

Armor penetration runes in RED runes
Physical dmg runes in YELLOW
Physical runes for BLUE
and 2 Physical dmg for Quint and 1 armor petration

it will make ur Mystic Shot do more dmg early on, and make ur ultimate have a bigger chance to last hit ppl like wen u try to snipe them

My runes are 23/0/7 i pick´d my runes as i did cus i want my Mystic Shot to do as much DMG as possible and my Utility masteries are for mid i need as much HP and MP regen as possible whitout needing to buy mana regen or health regen items at start.
And ofc u dont wanna be dead to long wanna laning in mid so get "God´s hands too"

my items is bassed on doing very high dmg wen u fire ur mystic shot and ult.

Sheen will make ur mystic shot do more dmg cus of its passive.

Manamune wont make u go out of mana that quick in Team fights and on top af that it gives u good AD

Hextech Gunblade will give u a massive amount of healing in team fights wen using Essence Flux and ur mystic shot will heal even more cus of ur Sheen will make it do more dmg and u will ofc heal more..

the rest of the items is most likely for dmg and armor pentration like Tha Black Cleaver

If u wanna u can try buying Archengel´s Staff instead of Blood Thirster that will give u a huge amount of AP and it will also get u more AD cus of ur Manamune.. but i like to play the build as shown..

My skills are ofc bassed on getting Mystic Shot as high as possible, as soon u can upgrade it u should if u try this build, it have a short CD and does a huge amount of DMG early on.

In lvl 2 u get Arcane Shift wen u will see that it will come in handy wen low lvl, besides u will allrdy have a flash as summoner spell whitch will give u what i like to call ."doubble flash" well rescue u alot wen fleeing and it will also make it a lot easyer to tower dive wen u can flash in and out.

U wont rly need Essence Flux wen going AD at start but no need to max Arcane Shift as-well so U pretty much deside that urself, i allways get it just incase ill need it sometime.

Well the Summoner Spells will not be for a typic mid build u normely get Teleport wen playing mid (well some ppl does)

But wen playing Ezreal i dont think u need it normaly u dont return to base before lvl 6-7 unless u go FB or somthing.. but wen u have ur Ultimate u can just shoot it from base and kill the minons and maybe hurt the Champ u lane against wen they are at ur tower, that will give u some time to get to ur tower (its nromaly best to RC wen u opponent does it then there is no prop, minions will move slow enought so u can get to ur tower before they reach it.

Flash: Well ez allrdy have a flash but i think its good to have 2 of them.. like for tower-diving its easy to get in and out that way.

Exhaust: Exhaust is allways good to have wen playing mid even if its a AD or AP or playing against it slows and reduce ur opponent dmg out-put and it will make it easyer for u to get FB and Gank ppl.

Well this is pretty much how i play Ez it normaly kicks *** :)

i hope it will work for you guys

Cya and BTW this is my first Guide i made so i might wrote to much.. prop..

TY..