The official line with the unfinity cards is that anything with the acorn logo in the center bottom of the card is NOT legal in eternal formats.
Compare this to
Saw in half from the same set and hopefully you'll see what I mean. The icon is the standard circle on
Saw in Half, so legal. Acorn on Planet Glurg, so not legal
That said, the only thing that determines legality when it comes to kitchen table is the people sat around the table. If your playgroup is cool with it, then it should he totally fine to play. As long as everyone is on the same page, you're good to go.
Card is really cool too. Personally I'd be fine if you sat across the table from me and wanted to play that deck. Always worth a conversation before hand, but generally speaking the casual commander community tend to be pretty
chill with being flexible about this kind of thing.