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.
My friend play this build and it is awesome !! AP over 750 is good and its dmg is incredible. try it... Its all about Ability Power and cooldown reduction. Your first abilty Thundering shuriken deals abou 900 dmg. At least you have to buy some magic pen. runes and than ingame you should buy only AP items + one spell vamp item. Sorry for my english :P