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.
With this build you can realy good rule in the mid in 5on5, or in 3on3 solo. Kennens spells and attacks have the same power. In my opinion its not usefull to push only one atribute.
Later you can easy kite 2 melees and finaly you can kill em, because you can add quick a mark of storm on the enemys by auto hits and you make a lot of dps with fast auto hits and spells....and you can easily push and destroy towers.....while using a "backdor"(yi or warwick style). And if an Akali or anyone try to kill you PUNISH and beat her or anyone else.
Finaly you regenarate a lot of HP with lifeleech.
The last item is your decision. If there are a lot of fast melees take something for more movement speed like zeal/phantom dancer.
And if you are carefully you can have a 3on3 stat of 16/0/4.
But keep distance.
And excuse my english^^