Quote from: https://treeofsavior.com/news/?n=484&c=31
"1. Do you have any plans to make Monster Gems or Cards tradable?
We do plan on making Monster Cards, Monster Gems and regular Gems sharable through the Team Storage in a future patch. Along with this change, we plan to make Boss Monster Cards become unobtainable through quests and will be deleted."
So in other words, use all the boss monster cards for Gem Leveling before the 16th august patch hits the server?