While I like the whole idea of a new shard per element, this card will probably need some balancing.
About my main point though, am I the only one that doesn't like SoG/SoD/SoR moved to particular elements? Especially if they cost quanta, it would make so many decks unviable. Tons of FG decks (to my knowledge) rely on SoG and making them require life quanta would be a big negative. SoD/SoR aren't used very much as is, so why nerf them to a specific element? (Well, with SoD, the only PvP viable deck I really use them in uses only light quanta, but that don't count...).
So many decks that AREN'T too powerful, but more for fun, rely on SoG for stalling and making SoG cost life quanta completely screws them. Even those that are competitively viable and utilize SoG aren't that bad. One last thing: Shard of Gratitude doesn't make much sense as a name for a life element card IMO.
Just my two cents.