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.
I publish my first team build witch I think is Op.
I hope you find this guide very useful.
Please vote what you think about it.
Runes + Masteries + Items + Summoner spells + Skill sequence
I already published it. The items you can buy the depending on the enemy team, at Malzahar or Veigar for example in case you can not get kills for some reason do not buy the Mejai.
If the enemy team does not have a tank do not buy Deathfire Grasp.
For Amumu, if the enemy team have more dps or ap try to concentrate more on armor or magical resistance accordingly.