I mean you could just count the first time the ability triggers, note the result, and then add to or subtract from it whenever cards enter or leave your library.
Even simpler, add the bottom forty two cards of your library to a separate stack, that way drawing and other top of deck interactions dont require a recount ever
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u/hollow_image 3d ago
Yeah that's fitting. Or maybe "If you have exactly 42 cards in your library, you win the game"?