| When you wrote in the flavor that someone would have to pay the price for another's healing, I was imagining abilities that would drain life from one target and give it to another. Some of the abilities do this, but not the basic one. Perhaps you can have the ability allow you to touch up to two creatures, and have the one spend a healing surge on behalf of the other, with the note that you may include yourself as one of the two targets.
This would also make the undead side effect meaningful, as you'd be able to weaken living targets if you maneuvered right. As it is, I see the weaken+damage thing as flavor only, as no one would do it voluntarily. (Unless they themselves were undead, and wanted to use it to damage others)
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