I got my first Earth nymph a while ago now, and, despite wanting a second, for someone like me it's very unlikely I'll ever even enter a tournament, never mind getting round to being good enough at the game and understand deckbuilding well enough to win one. This instantly rules out the only non-donation, non-luck based way of getting a nymph. Obviously, I believe that they should be rare cards, but I also feel as though right now they're mostly worthless as very few people have enough of the same one to use it in a valid deck.
I had this idea a while ago, after getting other nymphs I don't really want, a section of the bazaar where we could 'cash in' our rare cards for one of our choice, i.e in my case:
I hand over my water and darkness nymph, and in return I get back one nymph of choice.
I feel this still retains the rarity of the card whilst also giving those of us who want to use them a viable means of doing so. The idea could also be extended to weapons for a different reason, although they're more common, getting a 7th copy of a card is a bit upsetting, and having a reason to hold onto it so should I get an 8th I can get another weapon I want would feel a bit more practical than just selling it for around 150 coins.
Sorry if the first bit sounds like I'm just whinging about things, I think the tournaments were a great way of addressing part of the problem, just not one that particularly applies to someone like me. Please do let me know what you think as well, any improvements/suggestions/problems etc. would be welcome.