Sorry for late reply, all of your suggestions are awesome! I think Bounty Hunter, Doom bots challenge and Mistery Card might be a set of daily events that can rotate every day or two days. I’ll have to think about it, it’s something that can be done without too much effort.
Global chat is something we have in our own list, it just requires quite a lot of work to be done
More than 2 players mode is something we had in mind also but more like boss battles where several players face a single strong enemy, one at a time though, similarly as when you face several enemies in Campaign Mode. It can be a good friends mode against AI, but also can be thought as a pvp mode: a strong player against 3 lower level players.
Lastly 3 max can be a good concept for tournaments where rules may vary and restrict what kind of cards players can use.
Thanks for your suggestions you will definitely see some of them in the game in a near future