Excuse the awful late comment, I just found this thread.
Anyway, as should be common knowledge, Zanz already talked about a Quantum Pendulum. It would produce 3 random quanta or two of your mark, depending on the turn, and it would be a rare, but I digress.
If a Quantum Pendulum does make it into the game, I don't believe this card that girls made should be given credit, mainly because everybody and their mother has already talked about it anyway.
OP much?
Let's put it this way: A normal pendulum starts out as a pillar of one type, and switches to a pillar matching your mark, back and forth until you crush your opponent with balanced quanta generation.
Ex. Earth pendulum, time mark. You play it, it is effectively an earth pillar. When it creates quanta, it magically turns into a time pillar. Once that makes it's quanta, back to earth.
Now Quantum pendulum is simply Quantum pillar + mark combo. Hence 3 random/1 mark is balanced. You play it as a Quantum pillar, once it gives you all the quanta you don't need it turns into a pillar matching your mark, say time. It produces one time, then back to quantum pillar.
One of mark is balanced, also because it is FOCUSED. Quantum pillar is random, even thought it is more. you get 1/4 of the one you want on average, rather than 1.
And for the comes into play upgraded, Think of it as it is two towers combined. When it swaps, the comes into play effect doesn't trigger, but when you play it it creates quanta of the type played (quantum is 3x random).
[/rant]
And who knows if this is going in. Quantum marks is similar to this, theoretically balanced.
The problem is that rainbow is to versitile, taking the best from the best.
What we need is more bolt spells , such as fire, ice, drain, and stone skin. (you don't see fire bolt in rainbows now, do you?)
And consumption spells (miracle, fractal).
I know both of these have many ideas flying around.