I'll probably get a bunch of shit for saying this but.
Why do people think its so easy to get a Penta with Yi? It's really not. (Easier than some champions yes) But not easy, You can get CC'd, you can simply get burst down and or you could not even get strong enough to get a Penta in the first place.
"The key to Penta? Not Dying"
what you deserve1 votesSomeone hasn't tried the true OP yi build.
MÖRTIMER1 votesmine usually looks something like this. 
Raka Flaka MD1 votesYour ult blocks you from getting CC'd..
ViashinoWizard2 votesIt only prevents slows.
MÖRTIMER2 votesonly slows man.. stuns, silences, blinds, exhaust and like every other actual good CC is still effective.