I'm not sure if this is an already existing thread since i just started, but I've noticed that there isn't a trade system and there is many reasons why, but
How about you have to have a fair trade so like only about 5% differences in how expensive the card(s) are, (eg: Titan for Eternity is fair, same pricing. but Skeleton for Miracle, not fair, trading wont process unless the Difference is withing 5%.)