Hunter x Hunter: Card Master, the Strongest in the World.

(A million-word high-quality Hunter x Hunter fanfic already exists, please read with confidence.) While playing a pirated card game, Lynn is transported to the world of Hunter x Hunter. His cheat ability merges with his Nen power, creating the special Nen ability "Card Master," which allows him to acquire cards by defeating enemies or reaching special locations. [C-rank card: Naval Six Powers] [B-rank card: Gengar] [A-rank card: Uchiha Sasuke] [S-rank card: Blue-Eyes White Dragon]... As he travels to different places, his collection of cards grows, his titles increase, and he becomes famous throughout the world. The strongest player in the Heaven's Arena, the youngest three-star Hunter, one of the world's five greatest Nen users, the new strongest person in the world! In the blink of an eye, Lynn has become the strongest in many fields around the world! [Involves elements from: Yu-Gi-Oh!, Doraemon, One Piece, Naruto, Pokémon, Toriko, Jujutsu Kaisen, Fairy Tail, Onmyoji...]