They seem UP to me.
Compare this to rustler, which has a 1 input > 2 output, which is possibly the worst life card and definitely one of the worst cards in the game. This has a 2 input > 1 output.
Sure, this has more element diversity, but the point would still stand; this gives 1 of an element, for 2. Why not just use a pillar?
I feel that these cards are supposed to make trios, but instead just make a tiny bit of quanta fixing for rainbows they don't exactly need (Supernova.).
With all versions of the card, the quanta production has a bias, and is slightly weird according to your reasoning.
Take historic pillar:
"Death/Life is rarely paired. Life/Time and Death/Time are paired commonly." So, surely, you'd use time to generate life and death, right?
I think the cards should be like this:
Also, every element does have synergy. Elements that have less synergy is more so because thier cards do not combine very well, not because of quanta production problems.
A few combos that come at the top of my head:
Earth + Water = SoPa Wardens, Trident+EQ.
Life + Death = Empathatic bond + Aflatoxin.
Darkness + Aether = Pest + Fractal, Nightmare + Silence.
Darkness + Light = Voodoo + Holy Light, Crusader + Vampire dagger.
Gravity + Entropy: Discord + Black hole (One of the strongest combos in the game.)
Entropy + Air: Wyrms + Chaos power, FFQ + Druids.
Gravity + Air: Overdrive + Wyrms, Titan + Animate weapon.