User blog comment:RainNIU/Enhancing Undo?/@comment-5819757-20121230014538/@comment-5409486-20121230015249

A lot of people pay for cards, so without them the game wouldnt last long.

As for the main problem, no unfortunately they cant get your cards back. You can explain what happened and maybe have a better chance, but ive accidently used an UR, it was junk, but it was an UR and they said cause it was used to enhance there is nothing they can do about it.