It's unlikely I'll ever run any of the Universes Beyond cards. I originally got into Magic because I thought the art was really cool and different from other TCGs I had played. I thought the idea of internally consistent themes throughout the sets was an awesome idea that made each plane feel unique but connected. That was before they put Ryu and Chun-Li on a card.
I like Magic, and I like a lot of the UB properties like Street Fighter, LotR, Warhammer, etc... But I don't want them in the same game. If I were playing a Warhammer game and
Nicol Bolas showed up to fight some space marines, I would be unhappy. If I were playing SF and Gandalf magically suplexed Zangief... Okay, that would be sick, but fighting games commonly have guest characters and goofy nonsense to begin with.
I don't know. Something about seeing 'guest characters' in Magic seems wrong. I haven't encountered it much yet, but if it ever became more common, I would definitely enjoy the game less.