Here are 5 diffrent master yi guides to help you have fun ^.^

Make sure to alfa strike into the enemy ranks, and let the cc you, when they have launched ther cc's, you shall pop your meditate, this should give you quite good amounts of health and a lot of armore/magic resist

Your alfa strike should be totaly over powered, and if you are low on health, then you can use meditate away from battle to awoid cc

You need to sell your tear of the godess to make room for the second bloodthirster, and you need to sell your graves to make room for the second phantom dancer

This is my favorite, there is nothing to point at so just play

You need to sell your berserkers greaves to make room for a second phantom dancer.
When you get to a turret use wuju style and highlander to take down the turret faster