As much as I would love a quantum mark, it would be op (I think?) besides its nice to have the guaranteed quantum in rainbow decks
Would any mark that gives more than one type of quanta be OP? I haven't seen any explanation of why it wouldn't be possible to find a number of random quanta per turn that would be fair -- and if it had to be a fraction, then the number of quanta given by the quantum mark could also be random, with a distribution that makes that fraction the expected number of quanta per turn. Or it could be a nova mark -- using a turn counter to generate one quantum of each element every X turns (and again, a fractional X would become an X chosen at random after each nova).
If increasing the total number of quanta at all would still be OP, then a thirteenth mark could be something else, such as a "quantum balancer" -- consuming quanta of an element you have the most of, and giving you the same number of quanta of an element you have the least of, or that many random quanta.
That's because your mark is to represent a specific element. Quantum isn't an element.
Yep like Kamie said, your Mark is a representation of your elemental. Quantum is not an elemental.
It seems to me that your deck represents your elemental more than your mark does. That's why a shrieker/graboid rush player, who has a mark of time, is still an earth elemental. (And if I'm not running a mono-deck, then I'm not an elemental so much as an avatar or a weird... so why shouldn't my ability to control multiple elements extend to my mark?)
The idea of the player-character as an elemental is ruined for me almost immediately, because I think of an elemental as a manifestation of a single element, and thus a mono-deck -- yet all the starter decks are duos. That's why the first change I have made, or will make, on each of my alternate accounts is to remove as many cards as I can that don't belong to that account's element.
random mark?
That could be an entirely different idea -- the ability to change the deck's mark to one of the twelve existing ones, chosen at random, for 9 electrum. (So if we wanted a specific mark, we'd expect to pay 108 electrum, but we'd probably do it anyway and hope we're lucky. And we could still decide to make a specific change for 100, if we were unlucky too many times.)