Pros:
Interesting, Able to be balanced, Fits Water, Simple to understand yet complex effect on the game, Well understood by the author, Provably acceptable art
Cons:
How does water reduce the quanta costs(casting costs)?
This reduction may require more coding, probably just the card refunding 2-3 quanta after the fact.
I do not know if/when this is balanced. (very minor con that is unimportant when compared to the pro that it is able to be balanced)