I think the Castle joker ( https://balatrogame.fandom.com/wiki/Castle_(Joker) seen in the trailer) resembles Schloss Neuschwanstein ( https://en.m.wikipedia.org/wiki/File:Adolf_Hitler_-_Schloss_Neuschwanstein.jpg ). Painted by Hitler, the whole discarding cards to gain more power takes a bit of a sinister turn.
Discarded cards can't be played again until the next round. Essentially destroying them for that round.
Hitler is fairly well known for blaming Jews and working on their genocide.
It is a reach. But I saw the castle painting in The Gentlemen series, and thought it looked familiar.
Unless there is something else about the word castle, or that artwork that is relevant? Considering how on point so much else of the artwork and names are