Ok, so i just came up with this idea. Some people accidentally sell rare cards, right? Well, this is where my idea comes into play. A system to buy back any rare cards you sell!!
This would not be cheap, however. Rare cards are, well, rare. I think the ideal price would be 1429 Electrum. I took the cost of a nymph (in trainer, of course), added the cost to upgrade a card, and divided by two.
1358+1500=2858/2=1429.
So, what does the forum community think?