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.
Jax godlike build will help you to bring down any opponent! Don't rely just on this build, little skill would be desirable. Buildin' this, you build a champ, that can be used in pretty much any team fight. Follow this build, use your skill and you could easly jump into at least a 2 vs 1 battle.
BTW, this is my build any comment would be nice.