I think that changing the skill cost to 3 random quanta is more of a downgrade. If you can play the upgraded card, you need to have 3 Air quanta, which is most likely from a pillar (Cremate or Supernova isn't enough), and, if you have an Air pillar(s) already, then the cost shouldn't be much of a hassle. The effect of the card itself seems to be leaning towards Rainbow decks (or elements other than Air) because Air already has tons of Flying creatures. I think that the cost should change to 4/5 random quanta, and the upgraded skill should change to two or one random quanta.
Quantum pillar/tower? :3
Quantum tower is completely different - to play it, you don't need to already have quanta of a specific element like for Balloon Factory does. You are already paying Air quanta to play the card. You should either be paying less Air quanta, or not be paying any (change the card cost to random) making it fully Rainbowy. Otherwise, mono-Air decks would have no use for upgrading this.
