This yi worked very well for me. feel free to mod any way you want. Start dagger with wuju. build into berserker for a .917 AS. Buy two more daggers to start building phantom dancer. finish phantom and save for bf sword. if u have the gold grab another dagger. (ur gonna need for cleaver anyway) I switch back and forth between nashors tooth and infinity edge (extra ap and cooldown from nashor for meditate and ad + crit chance/crit damage from infinity) grab a bloodthirster for ad and life steal then last if need be grab the youmuu's ghostblade. penta kills all day.