Gravity and Darkness have quanta denial based around the enemy having quanta, whilst this stops them from getting quanta in the first place. Earth has EQ, which is the only card that does this. I would say that I should AVOID those three elements, Because this is probably going to be somewhat OP no matter what I use so I should not buff those three. In this respect, water and entropy is out because of their colours.
Yeah, I'd say time as well.
Mirror could instantly destroy decks that are mostly (X) colours and just use marks to splash in another colour.