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.
In champ select people are prone to leaving if you take good summoner spells so take exhaust and flash so your teammates don't leave during champ select.
When buying items remember not to key in your team to the plan, wait for the right time and then burst the chat log into flame.