Well, if you want it to nerf rainbows instead of monos and duos, I guess you can make this cap the quanta production per turn.
Ex. The opponent cannot produce more than 10 quanta per turn; lasts 3 turns or something like that. That'd kill SNs though.
shard of conscience doesnt seem very useful in its current form
i would suggest this:
turn SoC into a permanent
lasts 2 turns. 3 if using mark of aether
your opponent cant produce more than 8 quanta per turn
i.e:
if your opponent has 3 quantum towers, only 8 random quanta would be produced
as for nova, supernova, immolation,cremation and other quanta producing cards i am not sure how it would work
this card would kill raimbow decks easily
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i just posted this in the elements 1.30 topic like 15 min ago lol