Light nymph is definitely a nice addition to an RoL/Hope deck which is one of the best decks for fighting false gods. Since you're already using a fractal deck anyway, you're already partway there(also worth noting that fractal isn't that good in a mono aether deck since it uses up all your aether quanta and you have to wait at least one turn to play any of the creatures you get from it. It works much better in a duo especially with something like RoL's that give you large amounts of quanta to play your creatures and spells from the other element).
Whatever you do though, don't ever sell nymphs. The small amount of electrum you get from it can easily be earned in a short time on AI3 or by selling other cards but with nymphs, you're lucky to get one every 2-4 weeks even if you check the oracle daily. Sell any normal cards you want, especially early on when you're trying to get your first few decent decks upgraded, or even maybe a rare weapon if you're really desperate(can always get those back from t50 farms easily enough..for now at least) but if you sell a nymph and then later decide you did want it, it will likely be several months before you get another of the same one(and even if you do, having more than one copy would help most decks). Even if you don't ever plan on using a nymph as it is, keep in mind that there is always a chance that the card itself might be changed someday to make it more useful(as light nymph in fact has been changed once already).
