1) Design theory is not the place for card ideas.
2) Dual cost cards are impossible due to how the code is setup right now.
3) Earth and Gravity do overlap at large massive things so this card has good flavor.
4) If you made a Earth card with a Gravity skill or vice versa that would fit the game better.
5) I do not think tying the stats to the quanta pools is a good idea. (personal opinion)
How about
5
3|6
: Drain all
quanta and gain +X/5|+X
