idk it all seems to make yi stand out alot less as you lower his attack damage, running speed and lifesteal and actually even attack speed just to replace it with health and a small amount of AP. I'd say he would be way more usefull if you focus on the traditional way like i did in my build. You're free to compare and see whether or not your build would hold it against mine but i'd say mine would kill yours in 3-4 hits.