Earlier quoted context omitted.
yeah. scrolling this expansion list, you can see 2018 was really the last _block_ as we knew them: few sets labeled under a theme an author might write a book about also shortly after we see new sets stopped getting their own wiki articles https://en.wikipedia.org/wiki/List_of_Magic:_The_Gathering_s... https://en.wikipedia.org/wiki/List_of_Magic:_The_Gathering_n...
There is a whole format of pre-2018 legacy due to how starkly game design changed that year.
to verify, you're talking about https://prefiremagic.com/ aye?
cool, was only familiar with predh, which scryfall also filters on
https://scryfall.com/search?q=f%3Apredh+is%3Acommander&uniqu...