Tamirko maybe you´re right about the masteries but about the rest I think its ok. I have great results with this build so I tought to share it with you guys. Try it first and then we talk again about it =)
Thanks for the tips

Why would you pick archmage's savvy?I mean,non of her skills work on ap,it's way better to get deadliness along with the exhaust master,and -1 point on cd reduction or aspd for buff duration,also,I don't really like the itembuild,it's better to go infinity edge after phantom dancer and bloodthirser,triforce just doesn't give her that much damage.