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.
Nice a simple really, its not particularly hard to play Heimerdinger, and with this build its all about having a high magical damage output without sacrificing too much on defence. To be honest Heemerdinger is pretty OP still and annoying to face regardless of how he is built, but good fun to play.