It's out there but it also gives a the card a potential "Level 10+" for a common and for the rest of the cards based on the rarity. It could be a big advantage if they are played over time, but in a given battle of the extra buff in a single it may or may not really matter. Plus it raises the level of what the highest level players would need to gather for cards to stay on top--and there is almost no way to have double max gold everything (unless you're willing to put a massive amount into one deck) so more players would pick and choose their gold double maxed cards they went after. We have raised the "floor" of what lowest level players are expected to do to earn in the game, more than once, asking highest level players to do more would not be out of the question in my humble opinion, and this would open things up greatly. It would have to like for like swaps, meaning if you did it with for example a given reward card, then it would that same card. There also can be "wild cards" that can be used to combine something at random, pile any of your commons to make a random common, that possibility could be there also. Plus there is another component I to it that I am going to post about that could be done with "classic" or retired cards. Stay tuned for that, it is even crazier, haha. Thanks for the read @juxtapozed and keep up the great monster fanaticism!