Hi everyone!
And thank you for entering my build and guide to the champion: Master Yi.
Please be freindly as this is my first build :)
is not my main, as I really enjoy playing and and :)
But I have been playing a lot Yi during my time in League of Legends!

In this build, I am going to show you guys how to build up a nice Master Yi! Note that this guide is mainly going to be based on the 3v3 gamez, so do not complain with stupid things like "I got nuked cuz I went 5v1" and "This build does not work, Baron did me hard".
I hope you will all learn something from it, but if thats not the case, just skip to next guide instead of gounding this one. Thank you! :)

The reason why this build is called "Why'd you feed him?" is, that Master Yi is extremely easy to feed. If you are unaware when laning against him he can put out some extreme burst damage, and you cannot imagine how fast he brings squishy targets down. Master Yi can, if feeded, bring whole teams down! (And it actually does not require that much skill!)

Master Yi is an extremely nice melee champion and carry nuker. Though he looks like a ******** nerd with a shroom on his head, he deals so much damage late game, and he can get fed very easily, if the opposite team does not care.
He can deal insane criticals and has extreme attack speed!
This video shows just how Overpowered Yi can get if fed: Play Video Thats right: "Holy shiz" :)

Pros:

Nice damage
Good harasser
Powerful ulti
Can bring entire teams down
Good at pushing
Great at farming
Can jungle

Cons:

Squishy early game
Uses mana
Easy to harass
Can easily be Crowd Controlled

Double Strike

Master Yi strikes twice every 7th attack!
Double Strike is a very nice passive. It helps a lot early game, and can easily be used for harassing and minion farming. This is also the reason why Master Yi really scales with attack speed.

Alpha Strike

Master Yi leaps across the battlefield striking up to 4 enemies, dealing 100/150/200/250/300 (+1 per ability power) magic damage to each enemy with a 20/30/40/50/60% chance to deal 400 bonus magic damage to minions.
Alpha Strike is extremely good for harassing. It has so many uses, and deals insane damage. As it has a chance for dealing extra damage to minions, it also helps a lot when jungling and farming.

Meditate

Master Yi channels, restoring 140/280/420/560/700 (+1.65 per ability power) health over 5 seconds. While channeling, Master Yi gains 100/150/200/250/300 armor and magic resistance.
Meditate works great when laning against rangeds, but it is not a spell I prefer. Normally I skill up the damage instead, because when you get lifesteal, that is the best way to get your health back up.

Wuju Style

Passive: Increases physical damage by 15/20/25/30/35.
Active: Master Yi can activate this ability to double its effectiveness for 10 seconds, but this removes the passive bonus until Wuju Style becomes available again.
Wuju Style is Master Yi's bread and butter during early game and ganks. It really makes him deal so much damage, and that is why it is the first thing I level up. It can make you take down squishies in literally seconds, and if your passive is up this is so powerful.

Highlander

Master Yi moves with unparalleled agility, temporarily increasing Master Yi's movement and attack speeds as well as making him immune to all slowing effects. Additionally, killing a Champion refreshes all of Master Yi's cooldowns.
Increases Master Yi's movement speed by 40% and Attack Speed by 40/60/80%, and he becomes immune to all slowing effects for 6/9/12 seconds. Additionally, killing a champion refreshes all of Master Yi's cooldowns, and scoring an assist reduce the cooldowns by half.
Highlander is an extraordinarily overpowered special. It can be used to do almost anything. It can also help you escape if you did not use it when entering the combat. Now, what is really good with this special is, that its cooldown is refreshed whenever you get a kill (Much like Evelynns Agony's Embrace). That is definetely what makes you able to do those triple kills.

Runes

Greater Mark of Desolation Greater Mark of Desolation
has been chosen because flat armor penetration
gives so much more than many people think.
Seriously, it can be the difference between
life and death if you are going to face champions
like Malphite or Alistar!

Greater Seal of Fortitude
The reason why I chose this seal is, that just a
tiny bit of health can help you a lot early game.
And as it is the early game, where it is easiest to
get fed, this rune is just perfect!

Greater Glyph of Alacrity
Damn guys! I expected you to know this :)
It is Master Yi, and he loves some straight
attack speed. This is always useful!

Greater Quintessence of Desolation Greater Quintessence of Desolation
As Yi, you just can not get enough of that Armor Penetration

Masteries

I have chosen a kind of regular 21/9 build, because that works best on Yi for me. The extra gold from "Greed" really helps early game. The "Burning embers", will also give you some ability power to burst your damage with Alpha Strike!

When the horn of The Twisted Treeline calls, it is of course time to go down and get that first blood! (Unless the opposite team is all Sions and Tarics)
And for that, you are ofcourse going to need some items!
Therefore I normally start out with a Health Potion and a Dagger. This normally works, but you always gotto remember:
"The opposite team is just as strong as you. Never underestimate anyone" - Dragonfly

Now, when minions spawn you should start to farm gold. Try to get as many minions kills as possible, and if you can, harass the enemy. When you have got enough gold, continue your Dagger into a Berserkers Greaves. Now, you should start building up your jungle gear ( Wriggle's Lantern), so you can get ahead of the other players in level.

When entering mid game, you should begin to build up for your Phantom Dancer. This gives you great ganking ability, and you can move much faster than many of the other players. After that you go for Master Yi's favourite: Youmuu's Ghostblade

Now you have got the core build!

The rest of the items: Infinity Edge, Frozen Mallet, Guardian Angel, Bloodthirster, Black Cleaver and Madred's Bloodrazor are occasional. Really you should look at your team and the opposite team, and see what you need.
Fx. if the opposite team stacks a lot of health with champions like Nasus and Cho' Gath, and your team is having trouble getting them down, you should go for Madred's Bloodrazor and a lot of Attack Speed.
But if the opposite team is made out of squishies with good escaping abilities, Infinity Edge and Frozen Mallet would be a much better choice!
If they are stacking armor Black Cleaver would be very good for you.
I have also put Guardian Angel on the build, because it can be very easy to rage with Yi. As one of my friends once said:
"The rage is beyond your control" - Udyr, the Animal Spirit

Then you are on and ready for Pwnage! ^^

The two main summoner in my opinion are
-|-|-
Why?
Ignite Is really good in the early game, and it helps so much when you want to surprise your opponent and bring them down faster than they would have expected.

Flash Is propably the best summoner ability in the game. It just has so many uses if you know how to use it. Going into combat. Escaping. Running. Ganking. Nuking. You name it!

Other good summoner abilities

- Ghost - Even faster movement, great for ganks!
- Cleanse - Master Yi can easily get Crowd Controlled. This will get you out
- Exhaust - A nice slow for when you havent got your Frozen Mallet.

Do not take:

- Let the tank please. Let the tank.
- Nahh. Wuju Style will do the job.
- Why take this skill when you are not going to die ^^
- Yeah you use mana. But just don't take this. Buy a if you need mana.
- Ahh really? This skill is not needed in 3v3. Wards will do the job. Or one of your teammates will.
- Your movement speed will be faster than teleporting :p

- You can use your Alpha Strike on a minion to hit a champion. This works great for harassing.

- If you have Wriggle's Lantern, you can jungle to regain your health quickly, when leaving a team fight with low health.

- Meditate also gives magic resist. It can be used to save you from a fatal turret shot or that ******** annoying poison from Teemo or Cassiopeia.

- The sooner you get Wriggle's Lantern the better. If you are the one getting first blood, it would be wise to get that one instead of Berserkers Greaves, 'cause then you can star jungling before many others.

- Never forget to assist. If you think too much on getting fed yourself by killing minions in the jungle, your teammates will have problems bringing down the opposite team. Help them ;)

- Stacking Double Strike up to seven and then using Alpha Strike on your target can make you deal insane damage early game. This is very good for harassing.

- When you have finished your build, never forget to buy your Elixir of Agility and Elixir of Fortitude. Really many players forget that! Do not be one of those!

All in all, Master Yi is such an insane champion. He can be used for almost everything and is easy to play.
However, what really makes him epic, is the clip from the bloober reel of Season 1. You can watch it here! Skip to 0:35 for the action! Play Video Hehe. Well know we know he haz b@llz :p!

So what are you waiting for guys? It is time get out there and:
"Let the bloodshed begin" - Katarina.

Thank you very much for clicking my guide! I hope it helped you guys :)
Please comment and give a +1 if you enjoyed the guide.