Master Yi Build
Not Updated For Current Season
This build heavily depends on avoiding direct combat with other champions in the early game. It is important to farm creeps, harass champs with alpha strike and stay back. No champ hunting or team battles early on. If you don't get at least to zeal, you are pretty much useless in team battles.
The fun part comes when you get youmumu's ghostblade; then you can hunt down single champions that are trying to farm. In team battles, always stay back until the engagement and then activate ghostblade, ult and alpha to weak champs to kill em off.
When playing this, always remember that you are a hunter, high dps that cannot be stopped or outrunned. But if you get focused, you'll die instantly, so try to stay away from the heat and let tanks do their part.