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.
Build greatly inspired by this one:
but with armore pen instead of crit damage. If you do the math it's more interesting, see this link:
I'm still unsure about the item and the masteries though, any advise is welcome.