This is my first build editor. I am hoping to make this quick and easy for you to learn how to play the most OP champion currently in LoL. Lets just quickly take a look at what master yi is and does. Master yi is the best assassin in LoL, i guarantee you against any other champion they will fail if master yi is done their build. Master yi is the best starter character for any players. Lets get into the details now...

I choose these masteries because of his assassin type he is mainly offence. His masteries alone at level 1 will make him already a threat on the battle field. I made this master yi to be as OP as possible, so that the masteries will also help you late game as well (if you allow the enemy team that far in the first place). You might wonder to yourself why in the masteries I got some ap... well its simple, meditate is probably one of the most op healing moves in the game, and it can also gain more by ap. The ad should be pretty obvious why I got it. Other than that that sums up his mastery tree.

There is no real trick to playing master yi. All you have to know is...
a) use your ultimate at the start of a battle, because when they run (and they will) you can chase them down with utter ease
b) if you are a low level or having a bad game, run back to your turret and meditate all of your back.
c) If you are like me and love an insanely high CS or minion kills, you will want to use alpha strike on the minions while in lane, because while in lane if you use alpha strike on a minion it will not only hit a minion, but it will hit all minions and a player in that area.
d)In a team fight it will not be uncommon for you to get a penta kill, and if someone steals it... make sure they don't get another kill as long as they live. But make sure to use Wuju style to make you deal more damade, and use your ultimate highlander
e) the last tip I want to give you is a reminder, your ultimate cooldown is cut in HALF if you get an assist while using it, or if you kill someone with it active you INSTANTLY regenerate it.

This is my ultimate secret of master yi, this makes me 50-0-0 in games. Start off with boots of speed, 2 health pots and one mana potion... next jump right into your first phantom dancer, then upgrade your boots to level 2 with the berserkers greaves. After that get the blood thirster, now unless you fed them somehow you should be on fire and just racking in the money as we speak! Next you get an infinity edge because we like it when we kill everything in 2 seconds. Next you get ANOTHER phantom dancer for some more attack speed. Then the hextech revolver for ap, ad, and life steal. This will make meditate INSANE (not that you need it as much with all that freaking life steal). Now you think your build is done, but NO... we are coming in one last time by selling those cheap berserker greaves and getting something fun for the third time, get another phantom dancer. Now get out there, and raise some hell