| HELP Choose Deck Decks are comprised of the cards you select from your collection to use in a game. The minimum deck size is thirty cards, so if your deck is smaller than this, it will be shown in your list of decks with an (INVALID DECK) message preceding the description you have chosen. You may use the Build Me a Deck button to have the program assemble a deck attuned to the house you chose for your account when you registered. To choose a deck, click on the description of the deck in the list to highlight it, and click the OK button.