Two types of missions you will see inside of The Show Diamond Dynasty are collection missions and exchange missions. These missions often earn you points and/or are required in different programs.
Collections: Collecting a card will lock the card into your inventory. You will still be able to use the item in game play but you will no longer be able to sell the item in the marketplace.
Exchanges: Exchanging a card in an exchange mission, removes the card from your inventory in exchange for points towards a mission or reward.