Fair enough; it's not like the nymph changes are set in stone yet. The SoR/queen (or tears) deck was probably about the worst that the nymph changes could produce. I think the earth nymph should definitely be toned down a lot in attack power, though; it's almost got the attack of shrieker or the dragon, but cheaper, and with a much better ability. The light one has the same problem, but to a lesser degree, as it's not as powerful.
I know you've said before you want nymphs to be purely luck-based from the oracle, but it would be nice if there were a way to obtain them via a skill-based method. I don't know what you have planned for those trials, but I really look forward to them; they sound like a lot of fun! If you are dead set on leaving nymphs purely luck-based, perhaps a similar set of cards could be created that could be obtained only by mastering the trials.