After a Yu-Gi-Oh! duelist transmigrates, what sort of things would they find troublesome? Landing in the middle of an Alien invasion? Getting up off the ground, looking in the mirror, and finding a Golden Eye on their forehead? Or discovering that the Pharaoh is right in front of them, and that they've already activated Orichalcos as a villain? The duelists in a certain QQ group say these problems can at least be solved with a card game. But for now, at least, they absolutely cannot solve the problems of the Spirit World by dueling!
"Duelists, save the shattered Spirit World. Carry its radiance across infinite dimensions and restore the spirits to their true forms."
Thus spoke the Creator God of Light.
"Let's discuss our payment?" the duelists replied.
An infinite-worlds setting. There should be very little card-game content in the early and middle stages, but probably more in the later stages.
World progress:
Legendary Godzilla
Overlord (IF route)
The Mummy (Infinite Terror version)
If anyone reads this, I'll keep writing.