Card was a material similar to paper, it had more rigidity and could be folded into a shape. (PROSE: Alien Bodies [+]Loading...["Alien Bodies (novel)"])
Card could be used for origami, and was favoured by the Origami Empire of Draxos Eleven and Twelve. (PROSE: Sick Building [+]Loading...["Sick Building (novel)"])
When confronting the Toymaker in Soho 1925, the Fourteenth Doctor challenged his foe to a game of cards. The Toymaker won the game, but the Doctor was able to raise the stakes to "best of three", citing that he had won a game back in his first incarnation. (TV: The Giggle [+]Loading...["The Giggle (TV story)"])