When you start out playing Card-Jitsu in Club Penguin you get a starter deck of cards for the game and they can be pretty bad. You won’t win many games with them so you probably want to get some new cards. You can get them in stores or by purchasing them online at Amazon or other places. When you get a deck of these cards, they come with unlock codes that get you special cards that you can use in the Card-Jitsu game on Club Penguin. When you play other people with these special cards you have a much better chance of winning.