You may want to refrain from using the term ‘Smash killer’ for a while.
MultiVersus hasn’t even reached a stable state yet, but the modding community has already made it possible to add your favorite characters from other games. Want to add Link over Wonder Woman? Ganondorf over Superman? Waluigi over Shaggy? A darker-colored skin for Harley Quinn, based on her appearance in Injustice 2? It’s possible! Best part is, it’s dead simple. Just a matter of downloading the mod and putting it into the appropriate folder.
While it’s debatable whether MultiVersus will be a Smash killer, I’m happy to report the game now runs flawlessly on the Steam Deck. Previously, running the game was technically possible, but you would get kicked almost immediately if you joined an online match, due to EAC. Evidently, Warner Bros. listened to community feedback; after testing today’s open beta, I can confirm the kicking is no longer a thing. The game also has 16:10 support.