Master Yi Build
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This is how I generally would build yi from start to finish, I don't always get to the last phantom dancer or bloodthirster. Even so i usually take that route. If the game hasn't ended by then I would sell my boots and buy another bloodthirster or infinity edge, maybe even a black cleaver depending on if the enemy has a tank or not.
But anyways, test it out. See how it feels.
Thank in advance for any helpful suggestions or comments.