You know, of all these suggested cards... I think the Quantum Pendulum is a must. Would really help the Rainbow/Other deck combos I see floating around. For instance that pure rainbow one that uses Time cards to get quantum pillars and monsters out faster. Actually wished I had some myself several times when building new decks.
While we're on the subject, I wonder if the idea for a Quantum Mark has ever been suggested? Not even sure that could even be submitted as a card idea... One might wonder if that'd be over powered because down the road there might be more cards that use random quanta, and that would change your quanta output from 1 to 3. To circumvent for this might mean to reduce the random quanta generated to 1 per turn.
So anyways, I see a Quantum Mark and a Quantum Pendulum going hand-in-hand. I definitively want to see that Pendulum though. If you add one, why not the other? Understand if others see it differently.