I have been all through the design ideas of "Crystal Heroes". And just today, I looked some of my "prototypes" for the "core" game. And I came up with some AWESOME ideas such as multiple card "melds"... which add a whole new "dimension" to the game!
I was working with "operators" and "operands" in a later design... And while the ideas seemed cool -- I couldn't get everything to work together. That was until today, where I suddenly realized that "melds" solved all my problems.