I really like this idea. I think it provides players with a great reason to spend all of the gems that they save up but also gets them more involved in community servers. I feel like sometimes those are pushed to the side by MPS and don't get used as much. I think exclusive games would attract more players to use them instead and would be more of a perk to purchase Eternal to get access to your own MCS. Being able to play some of the holiday games and past brawl games sounds really fun to me as well. I'm not sure about including Nano Games since, as others have stated, the coding for it doesn't really work for MPS or MCS. However, maybe individual games inspired by those could be created to be exclusive to MCS.