I think you might like some of the lesser known systems. Your perspective would fit in(or at least it would have a place in) well with systems that represent a world setting that is a little darker brutal savage or just more open.

Burning Wheel, GURPS, Savage World and just about any World of Darkness version/flavour

I really like this idea

Plus there's the idea of error stacking (basically cancers) every time healing takes place of reviving someone there's a little bit of error. And over time those errors start stacking on top of each other.

Damn I'm so gonna die of cancer by the age of 300 if this was in my campain

What if the spell simply accelerates the healing process. Basically like a forward targeted reverse time reversal?