Let's design a fucking game together

Hi nerds. I want to design a website with a small card game (like Yugi oh or Magic or that kind of shit) but the thing is has to:
* Have a fixed set of cards (that is no custom cards)
* Games should end in a range of 10 - 20 turns mostly.
Since you are nerds and expert on this kind of shit and enjoy the autism of designing things, i wonder if you could kindly help me.

UwU

>>11

Actually, setting could help defining a rule set. A game with super mario rules set in World War II times would look silly (Stalin destroying bricks with his head), while an FPS like Wolfenstein looks okay. I.e. if you pick WWII setting you won't be thinking about designing super mario, but would go straight into designing wolfenstein, some wargame or economic sim (Sim Auschwitz or Sim Gulag).