There is a delay from the time the token is stored by the create_card to the time it is reflected in the list_card.
I think it is about 4 seconds, but this can cause malfunction.
I would like to see something done about it.
Yes, there is a delay from the creation of a card on file to when it’s available with ListCards. This is cause of asynchronous functions that happen on our servers. Also is there a specific reason that you need to call ListCards after CreateCard? You already have the response from CreateCard that has all the same card information. 
I use ListCards to display saved cards, so the delay should not exist.
If your listing all the cards for a specific customer_id after the you created a card for them you can display the results from CreateCard and include the results of ListCards to avoid the delay from when the card is available with ListCards as a workaround.