What I was trying to do was to come up with a card that would make shields more usable. Having a single slot for Weapons and Shields makes them fairly hard to use. Weapons got animate weapon, and that seems to have helped them greatly. I was trying to make some sort of equivalent card for shields, that did not fallow the exact same dynamics as Animate Weapon. Light seemed like the ideal element to put such a card in, as it is the only element to have three shields(Though earth would have also been fitting as it is the opposite of Air).
Healing alone acts as replacement for shields, not an augmentation. That would have the adverse effect, as people would use the card alone and not use it to accompany shields. As for implementing healing into the shield, I couldn't find a good way to make that happen. A simply phrase like "for every point of damage blocked by your shield, heal 1 hp" would make the strongest shields stronger, and make the weakest shields weaker. The most fair thing I could think of was, "If you have a Shield, heal 10 hp at the beginning of each turn", but that still seemed a bit weird as it would essentially encompass Sanctuary, and the already pitiful SoG.
