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.
Once again this is just my personal Zilean build. Don't really expect anyone else to follow it but he has worked out quite well for me in the past (and hopefully in the future, only Zilean knows). I don't claim to be anywhere near a pro at this, just having fun with the free game that Riot has given us.