Love the idea. For some reason I'm picturing the girl in Big Hero 6 loading cartridges in and firing them out of some sort of gun to make different combo's. Though I agree if it has a similar 'enter combo + activate' like Ninja, they'd need to solve that lag issue. Its bad enough on a dps. As a healer it could be catastrophic but we have a while before a new healer crops up so skies the limit. It has a lot of potential for some neat effects and moves. Maybe a combo that is a ground targeted plume of gas/smoke that tags anyone who passes through it with a regen effect? Or maybe they can mix concoctions and place them on the ground. Lets say, maybe they can have two up at any given time. First player who runs over it, activates it and gets a heal etc? Definitely one I'd like to see fleshed out as well.