Great! Also, first time I read the word "bijective" in a TTRPG. Very well done. I think a variant could be: there are no Xs on the table BUT every time you roll another d20 and if the numbers match you get an unexpected paradox.

This kicks a ton of ass. How you managed something like this in 48 words is beyond me. Major kudos.

This is a really neat system! Seems like a play session could have a good amount of variety in length and what you can do with it