Hello to you all. My name is adam000133. You may me from other shows such as... nothing. Here are 2 guides for you to read up on, practice and then rape all nooblords with.
I also want to give ALL credit to Hackee on creating the Dunk Yi guide. He is on Solomid so I don't know if I am allowed to link him...
I am only doing this guide so more people are aware of how awesome and fun this guide actually is. I have had games where I have done flawless with this build due to sheer speed. Trust, this build is sick.

This guide will first start with the Dunk Yi Guide, then the Flawless AP Yi guide.

See what I did there?
Ahem, once again, all credit goes to Hackee on solomid for making this guide. This guide is for the strong. The build revolves around "going fast."

So summoner you have decided to play the baddest hero in League of Legends: Master Yi
Why should you play master yi?

Well for starters he has 7 eyes, think about all the things he can see
Next he has the katena, the best item in the game. It helps Yi kill really fast and is honorable
Watch out summoner its the swordsboots. it helps yi kills faster and he can run around really fast and make the enemy angry
Checkout that Trenchcoat, it makes yi looks like a baddest and it makes him cooler
He has some thing in his katena but they are cool. Yea

Click here to view the pro as heck guide to pwning nooblords with master yi

Smite
Revive

Before you can be fast. You have to set up your skills
I choose Revive and Smite
Revive makes Master Yi go really fast and Smite helps you kill fast.

These summoner spells are MANDATORY

Masteries are not needed for this guide, but if you really want to dunk even faster you go 21/1/8

getting 1 in defense will be able to let master yi farm faster, making 10 gold every smite and gains an additional boost to revive. getting this mastery is MANDATORY.
the 8 on utility allows mastery yi to maximize his move speed potential, making his enemies run away from him with fear. the expanded mind mastery allows master yi to fight more in the jungle, giving him more sustain in the jungle and letting him use his skills more

you can put the rest to whatever you want. I don't care. You only need 9 mastery points to make master yi to his full potential but i put 21 on offense so you nooblords will be able to fight in the jungle even faster

Runes are also not needed for this guide but if you really want to play the not honorable way. These runes will help you dunk really fast

Red: Greater Mark of Attack Speed x9 - This helps you dunk faster
Yellow: Greater Seal of Attack Speed x9 - This helps you dunk faster
Blue: Greater Glyph of Attack Speed x9 - This helps you dunk faster
Quints: Greater Quintessence of Movement Speed x3 - There are many nooblords who tries to run faster than you. Get move really fast quintessence so you can run away from battle with swordboots and dunk the nooblords with your katena

As soon the game starts, you need Clothing and 5 Red Sodas because being naked on the battlefield is not cool at all and you need red sodas to not be dehydrated.

After you eran some of the dosh, turn your clothing into the X-Men claws so you can bust up those rude dudes even faster. Buy a rad scythe too . It has a skull so you must buy it. Transform the Rad Scythe and X-Men Claws into a wiggles lanturn . It helps you kill faster and see more. If you don't even buy this Item, you might as well uninstall the game.

You get your wiggles lantern but you are still slow. Get a move really fast boots . You'll be cruising in no time.

Finially you buy the best item in the game: the Double swords . Its two swords in one item and it can't get any better than this. Buy 3 more doubleswords . At this point your opponent should just surrender.

Once you get all those items you will be a dunking machine. Start dunking nooblords and win the gaim for your team.

If you dunk enough nooblords, transform the double swords into red double swords , where the red is covered by the blood of the nooblords that you dunk.

There are many bad things in the evil forest. These are:
The stone bros
The rude dudes
The dog
Boss 1
Boss 2

These are the evil critters that lurk around the evil forest.
The rocks are very important for your dunking skills. You don't want to give any of your buffs away to your nooblord team because Master Yi is the best champion in the league.

If you are too weak for the forest, don't worry! These skills work perfectly in the lane too. You can even get some sick frags with your smite too

"FAP" Stands for Flawless AP. It's legit, I swear.

If you want to be a badass Master Yi then go for mid and use ability power.
FAP Master Yi is "useless". "useless" is a code term for "the highest priority of victory for your **** team." It is simple to win games with FAP Yi.

Alpha Strike has a 100% AP Ratio which means if you have a level 5 Alpha Strike and you have 250AP. Your Alpha Strike will deal 300 (+250) Magic damage. You can't forget how amazing Alpha Strike is for farming! You can harass, farm and push like hell (if you want) all at once!

The thing that will allow you to live for so long is...

The reason of Meditate being so good is it's 400% AP Ratio! You can easily heal more than your current HP with this shiz. It gives 300 armor and magic resist to ensure that you survive when healing. People will complain that it is overpowered. If this is the case, run into their turret and heal in front of their eyes and complain how weak they are. That should **** them off. :)

Another reason for FAP Yi being good is that he has very high Attack Damage with his Wuju Style because it gives a +15 Attack Damage passive at level 1 which can only get higher until level 5.

Finally, Master Yi's Ultimate is Highlander which is very usefull for FAP Yi. Have you just used your Alpha Strike on a cluster **** of enemies after you activated your Highlander? What's that? You just got an assist? You have another Alpha Strike ready in 1 second!?

Highlander will decimate the enemy team in teamfights since whenever you get a kill, all of your cooldowns on EVERY ability (other than summoner spells and items) will reset and can be used instantly. An assist will half the cooldown from it's normal cooldown. Example: Your Alpha Strike has a 10 sec cooldown but you have 6 seconds left on your cooldown. Your cooldown will be reduced to 1 second. You also get a large movement and attack speed boost once Highlander is activated. Highlander also makes you Almost impossible to gank. If you have mana, you're fine from that jungling Nunu & Willump.

FAP Master Yi does not need many items to become a raping machine. You simply need to spend LAODSAMONEH in order to become powerful.

You can either start with a Doran's Ring or Boots and 3 Health Potions. I would reccomend boots against a champion such as Morgana or Brand. Mainly champs that will skill shot your *** or make **** appear from the ground.

I usually like to rush to a Needlessly Large Rod because Master Yi can make his wang bigger and better for that Caitlyn. By wang, I mean damage. The +80 AP is a huge jump from the 30 you had. (30 is just a guess, don't worry.)

After you get a Needlessly Large Rod I would reccomend getting Sorcerer's Shoes against any champion similar to Morgana or Brand. If you are not against any champion like that or you feel that you are good enough at dodging, go for a Rabadon's Deathcap as this will bring your 120AP to a whopping 200+AP!

Deathfire Grasp is next on my list simply because, why not. You can harass with this item, as well as change who is going to win the big team fight. GG WP.

Chalice of Harmony can be taken before Deathfire Grasp because Master Yi can get mana hungry EXTREMELY quickly. He has very high mana costs especially with the Cooldown reduction we are going to purchase!

A Lich Bane synergises with Master Yi very efficiently. Press Q, proc your Lich Bane. Wait 1 or 2 seconds, press E proc your Lich Bane. It's easy as 1, 2, 3.

Rylai's Crystal Scepter gives a very nice amount of Health as well as a slow for your Alpha Strike. Nothing is better then getting a cluster **** of enemies with your Q but slowing them also!

Finally, our last item to complete this build is Athene's Unholy Grail. This is also a very usefull item for FAP Master Yi because getting kills and assists is all that FAP Master Yi does! You either Kill steal or you get your kill stolen. Either way, you get a nice amount of mana regen and a large cooldown reduction. THIS SHIZ IS GOOD!

FAP Yi does not need much. You don't really need runes at all! You can get all your **** done with a single Rabadon's Deathcap. But never the less, here are the runes.

Greater Mark of Magic Penetration x 9. Magic Penetration is good. Get it.
Greater Glyph of Scaling Ability Power x 9. Ability Power is good. Get it.
Greater Seal of Scaling Mana Regeneration x 9. Mana Regen is good for FAP Yi. Get it.
Greater Quint of Potency x 9. Did I mention Ability Power is good? Get it.

For my Masteries, I have chosen 21/0/9. This is your basic Ability Power Champion masteries. All effective and God said it was good.

You could also go for 21/9/0 for more defense as you are as squishy as a LeBlanc!