Master Yi is one of the most OP characters ever in leauge of legends, if you play him right. i have messed around with items and variety of tihngs but i thought i make a guild to everyone that wants to use master yi! ( i am going to fly through this really quick)

For runes i take mainly Attack speed and crit to boost my attack speed up a little

For masteries use this for flat but if i know who i am facing i might adjust it a little feel, free to experiment!

For items i take this build EVREY time i play yi its got very high attack speed and life steal with both work VERY well together. The PD`s have both AS and Crit which goes with infinity edge to gurantee a crit every time you hit something. At the end of the game i hit about 500 each hit with about 2.000 Attack speed that 1 thousand damage each second :D

i hope you like my yi build it works very well for me!