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 tend to switch between different summoner spells depending on my team.
My main set up is Clarity and Flash.
I always pick flash cause it will provide me with a tool of escape.
But sometimes i pick either Teleport or Ghost instead of Clarity, for better map control (this obviously also changes in my masteries)
I’m sometimes send mid, but i prefer a side lane, because it's way easier to harass in the sides and at the same time I can support my lane buddy, using my imp clarity, heal and shield. I often use my ult to interrupt other ppls ults or to knock them behind my tower, giving my team an easy kill. But ofc it can be used too heal my up team too ;)
Items: Normally I only just get my Zhonya's, but a few times i have reached Lich Bane, which made me the most powerful champ on the map :P The reason I get it late game is, that it's useless unless I have a **** load of AP to charge it with ;)