Pretty good cards. I like the theme, and how you incorporated that into the contrasting mechanics.
No clue if they're balanced or not; eyeballing it, the fire one is just about right, while the water one may be a bit under-powered. Generating quanta should cost more than denying quanta, as the average 30-card deck currently used in the meta generally wants less and less pillars. However, if the fire card is expensive enough to use consistently then you won't have enough equally-expensive cards to make use of your spike in regular quanta production. On the other hand, if the water card is affordable enough to combo with other denial cards such as Devourer, Black Hole, and Discord, then it could lead to OP denial decks. Which leads me to conclude, again, I have no clue about this card's balance.