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.
One might consider buying a Guardian Angel instead of a Warmog's Armor. Stay close to your teammates in team fights and spam your abilities whenever teammates are close. When in lane with a friendly DPS try to let them get the majority of the last hits. The purpose of the build is cooldown reduction, mana regen, and most importantly the auras the items have. Use teleport to get close to the action fast. Will of the Ancients and Abyssal Scepter could also be used if you have lots of AP champions on your team.