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.
This build will really only work well at a high level and long game where you can actually afford these things. Just get an Amumu to stun a crowd, Brostorm in the middle and well... You can guess what happens.
I made this at 3:30am and I know it sucks but whatever. lol. Try it out for lulzing if you'd like.