Other ideas (steal them as you see fit):
should be something like. "Play the first card of your deck without paying its cost. Lose life equal to twice the number of quanta it costs". But that would be AWFULLY powerful for FGs (Rainbow... O_O). Tweak it as you see fit.
"destroy a random enemy creature, then lose life equal to its cost". Or something.
"each player plays a random card from his hand without paying its cost" would be cool, but probably OP.
"each creature loses 1 hp per turn". Inferno.
"all creatures get +2/+2" or something.