Since the only damage Bard has is his Q, I think it would be cool if his health kit damaged enemies when they step on it. That way they'd have to make a choice on whether they wanted to lose health to stop an opponent from healing or not.
You want to make one of the currently most broken champions, even more broken? Hahaha.
Next you're going to say his ultimate should make his team invulnerable to damage and give them the ability to still damage enemies caught in it.
I dont think making it a raw damage would be a good idea. to much solo-lane potential, and not enough roaming. I sugggest, personally, making it so that if an ally champion doesnt have vision, then the bubbles become red and seek out enemy champions who have vision; dealing a small amount of damage (say 0.3AP) and granting global vision of them.
