This is my first build. It focuses on giving Master Yi attack speed and life steal. That way your health bar will drain a lot slower than your enemy's. I added crit chance and crit damage boosters to make Master Yi unbelievably powerful.

I have not tested the build yet but will get to it. The items give him attack speed and life steal. If you wish to divert from this build just select different items that fit this build. Together they look deadly though. I added the Infinity Edge to make your (common after finished build) crits unbelievable damage. That is what will change a battle from a win to a lose. The Executioner's Calling helps everywhere for Yi. Crit chance, its passive, and its life steal. The boots are for the speed and for the always wanted attack speed. the Phantom Dancer is a must for Yi. It helps everywhere and if spammed could be disastrous. Youmuu's Goastblade is used for its passives and actives and still follows the build.

The point of the skill sequence is that you want to get Wuju Style first and upgrade it first. The Highlander should be upgraded whenever possible because it is an ultimate. Alpha strike should be upgraded when Wuju Style and Highlander can't be upgraded. Meditate should only be upgraded when it is forced to.

The runes are all giving flat attack speed which will help a lot during the beginning of the match.

What I selected for the masteries shouldn't be strayed from. They help a lot.

Pros Cons
Large attack speed. Squishy at beginning.
Good life steal. Bad in team battles.
Great crit power. Other stuff I don't care about.
Great crit chance.
Late game dominance.
Can destroy turrets easily.

My favorite part about League of Legends is to complete builds and use it while it is completed. That is when Master Yi shines. Completing a build with Master Yi most likely will give you a win.