I just changed a few dozen cards - I actually went though, sorted the cards by mana, and adjusted them accordingly. Some cards may be a little more powerful or less then cards in the same range but that's okay, that's the way most CCG's work. But there shouldn't be that many obscenely ultra-powerful techniques any more.. I hope.
Also, the buy/sell singles bug is fixed, aswell as some card text and abilities not matching what they do/say. if you find any other errors, you canpost on the forum, aim me, or use the fancy-shmancy new comment thingy. Hooray!
Also, here's a warning, the system will automatically prune people who have been inactive for two months (or one month without authorization) so be wary of that.