You mean "While this card is in play..."
"Until X, Y" means Y is False, then X is True, then Y is True.
I like the Idea but it only has limited use. If you could expand it to all creatures you conrol it would be better. Also i would lower the cost since it doesn't pose much direct treat.
I agree that it needs a usage wider than pseudo-rainbow Water. In addition, I don't like Water having rainbow aspects, I've always thought of it as the duo element. What about:
"Target creature: Gain 12 quanta of its ability's element. If none, gain 12 random quanta."