(Sci-fi + Cards + No Harem + Underdog Rise)
I transmigrated into a world of cards and became the ruler of the universe with my cards.
My talent is useless? I use card-crafting talents to crush the geniuses.
I have no connections? The ancient cards I restore have the Federation bigwigs fighting over them.
My parents are missing? Following the clues, I uncovered a truth that could turn the world upside down.
Insectoids: This guy wiped out an entire legion with a single card!
Evil God: Why can his cards nullify my rules?!
Federation: Please, stop using those cards nobody understands!