Hey I just wanted to share how I was able to get Marvel Rivals running, although I’m on a different distro it should work for you:

In the Launch options (right click game > properties > general tab) enter this:

SteamDeck=1 %command%

Then, it tricks the game into believing you are on steam deck, and it should run. If you want to disable the performance metrics, just press right shift+f12.

I’m a recent lifetime windows user to Linux but loving it! I’ve dual booted so I can still play stuff like fortnite/call of duty but surely those will come around as the user count climbs :)

Edit to add: I found this fix on protondb.com - you can usually find others posting helpful stuff there relating to any Linux game!