Other contributors have said "How do you create your own dojo in club penguin?" is the same question as "How do you get better card in club penguin dojo?" If you believe that these are not asking the same thing and should be answered differently, click here
You must buy card packs at stores like Toy's R Us or Walmart. Those card packs come with a code you can enter in which allows you to have better cards.
Note: There are comments associated with this question. See the
discussion page
to add to the conversation.