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.
Item: Start with Meki pendant and a health pot. Try to stay in your lane longer enough to buy at least your Chalice of Harmony and boots if u stay long enough. After you have enough go back to base and get you Mercury's Treads the bonus Magic resist helps you own your enemies more or you can go with Sorcerer's Shoes for more Magic penetration. By now you should be able to jungle and help with team fights or ganking. Build your Force of Nature then start on your Abyssal Scepter then your Guardians Angel. If the game is lasting long enough sell your Chalice of Harmony for either a Zhonya's Ring for more Ability power to nuke down your enemies or a Banshee's Vail if u need more survivability.
Pro's: You will own your enemies, help your team/save them, and own your enemies.
Con's: May take a while to get full build, not a beast early game
Summoner Abilities: Ultimately it is up to you but I recommend Ghost, for chasing or escaping your enemies, and Ignite, to finish off your enemies or Ghost and Cleanse, for getting out of those bad situations.