Concept Idea: Give yasuo an innate greivous wounds.

We've all seen it before. A lategame yasuo 2v1s at 1/5 health, and proceeds to not only win, but come out of the fight with 80% to full health. Even after the hotfix, warlords is really strong on yasuo due to his passive, which allows him to spend 1300 gold for 40% crit chance. Warlords makes both his late game and laning phase massively annoying. This healing factor, plus his shield passive, generally make him cancerous to lane against if you're playing a champion that doesn't have a lot of early game strength or if your champion generally doesn't have a lot of burst, as the combination of the heal off of warlords and his shields renders you nearly useless.

Give his passive another part. Say that the scars yasuo obtained during his travels inhibit his healing. If Yasuo is supposed to be this fragile high damage champion, make it so that he cant simply become a life-steal fueled machine of death.

Like I said, this is just a thought I had earlier, and I'd like to see some other people's reactions in response to it.