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.
Not much to explain.
Get Sheen first cos its the best dmg Item for Ez in the beginning, then Manamune to get some Mana and AD.
Next go Archangel and Lichbane combined with Sorcerer's Shoes.
Now its your choice. Zhonyas, one more Archangel (150AP) or some Health so get Rylais, but take some AP not AD plz.
Pwn. Early as well as late game.