Buff the Master's channel heal.
I've always felt like it was stupid that you could knock Master Yi out of his channel heal with hard CC. I feel like nothing should be able to interrupt his "Meditation". Isn't that the point of meditation; that you don't let things interrupt you? It's always seemed backwards and annoying to me as a fan of Yi that this ability can be disrupted. Considering this champ is under-powered anyway and he does 0 DPS while healing I feel like this is a fair and minor buff. It would allow Yi to enter group fights and tank some damage without getting melted instantly.