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 This Build I Focus on Playing as Midder. You start off with [*] Dorans Shield and a health pot. When you get to the mid lane you should go infront depending on the enemy setup, if there is any stealther like twitch you should avoid it. It Might be riskfull.
Play Aggressive and hitting as many Thundering Shurikens as Possible, after you have harrased the person down and you got the full rotation (aka Q W and E ability) you go in for the kill. (Remember to have 1 or more stacks before opening) Rush in with Lightning Rush and Electrical Surge and dont forget to use ignite. Follow up with Auto attacks and thundering shuriken when possible.
After you Probably killed your laning opponent you should probably level up to 6, then you go in for the other kill and if you dont got a chance on that hero, push middle lane and go Top or Bot to gank depending on how much either of the lanes have pushed. And with the ganking you probably have gained some stacks of Mejai and got your hands on Rylai's Crystal Scepter Which you got a big head start and should keep on ganking and leveling as usual.
In Masteries i went with 9/0/21 for the Cooldown reduction and More EXP. And for my Summoner spells i went with Teleport and Ignite. You can also go with Exhaust or ghost.
I chose Teleport so i can teleport to diffirent lanes and gank/defend or farm minions. Ignite is a great summoner spell to use in your early game ganks. I dont see why you should use exhaust when you can stun a few times in a team fight.
My Runes i go for Magic Penetration Marks Cooldown reduction seals and Ability power per level Glyph's Along with 2 Ability power per level Quintessences and 1 Fortitude.
Good Luck and may the Thunder Rape your Enemies