(my 1st guide so if i left something out make sure and let me know)
This is my Ez build. Alot of people dont like AP Ez but i love it, i wreck so hard people always think im hacking. At full build i would do about 200+ with Mystic Shot, 800+ with Essence Flux, 800+ with Arcane shift, and 1500+ with Trueshot Barrage and with great cooldown reduction on all my skills.
I usually go mid with Ez to get an early lead, I try and ignore doing damage to the champ im up against the 1st 4 lvls of the match i just last hit minions with Mystic shot, at lvl 5 i start hitting him with essence flux witch would be doing 200+ damage already, so at lvl six i would have chewed his health enough to finish him off with my ult. And always keep an eye on the other 2 lanes, because if your team gets them low enough hp you can usually kill them as they think they are safe behind their turret. My build is made for hit and run tactics, so always stay behind your team mates and do damage from there. By the time your 11 your ult will be really powerful against almost any champ, so start team fights with your ult and try and hit as many enemy champs as possible, it will get them low enough HP so they will start running away, so your team can pick them off 1 by 1. By the end of the game you will notice your arcane shift and essence flux will be doing so much damage that it will take almost any enemy champ to 1/3 of their health alone by witch then you can finish them off with your ult. My average deaths are 0-2 because of my ability to get away. so try before u judge and have fun with the BEST champ in game(my opinion)and make sure to line up those skill shot where the enemy is going to be,and not where he just was. o and if not that much magic pen is needed feel free to replace haunting guise with Death fire Grasp for more AP