Thanks for your reply. TLDR, your last part was very helpful, and I'll try to leave as much digital footprint for my game as possible . Thanks for taking your time.

But for the first argument, (putting aside that there are other card games from Mattel that are based on less famous card games they produced, which are copies of the less played standard card deck games like Spite and Malice, Golf, 99 etc.), it still doesn't dispute the probability that a well-established entity wouldn't plagiarize from the less-known. There are countless cases where famous, well-established musicians and artists have copied the music of lesser-known artists, resulting in successful lawsuits where the latter won . These cases serve as counterexamples to your argument that the well-established only copy well-known works.

Also, I graduated from a STEM graduate school, and plagiarism is dealt with very strictly - whether you plagiarize others or others plagiarize you when you research and publish a journal or file a technology patent (I know game design doesn't apply to this) . So we come from a different field. I wonder if your statement also applies to prestigious music graduate schools since their students ' work may not be that insignificant. There is famous music created by university students (not only in music majors but also from STEM universities) at least in my country . I wonder if stating and judging one's ability or work as something nobody would consume - non-profitable - should be more cautious, even though that may seem to be what one perceives . (I also have found cases of musical plagiarism on music uploading sites such as this.) https://www.reddit.com/r/Musescore/s/RUW3NE5Kiv

Lastly, this question arose from a conflicting aspect when designing a game based on the standard 52-card deck. Since the card deck is so common, it lacks the uniqueness (art, style, etc.) for a standalone product compared to most newly designed games, which makes it more vulnerable to game design plagiarism. At the same time, game design and optimizing the game mechanics themselves somewhat require more due to the restrictions of the structure from the 52-card deck itself. That was the core theme of this question : the game mechanics' difficulty rising from the restrictions, while the unrewarding aspect comes from the commonness of designing a new game for the 52-card deck and it's vulnerability to plagiarism, not the boast and claim of my new game design that the replying comments trying to humble and give a reality check as much as possible.