This cheat/easter egg is for when you are supposed to fight Ishizu in the Art Place. Battle and defeat her to get 30 deck capacity points and about 50000 domino. Then lose to Setto without using an ante card to get sent back to your house without losing a card. When you go back to the Art Place, you can do the same thing over and over again! This is the best way to get a good amount of deck capacity points and Domino.