Animation Throwdown: The Quest for Cards is a collectible card game from Kongregate. The game features tons of characters from popular cartoons, such as Family Guy and Bob's Burgers. When you begin the game your deck is set to Auto Deck. You can customize your deck by tapping the gear icon in the lower right hand side of the main menu screen. From here you can disable the Auto Deck option, then navigate to the Deck section to customize your deck with new cards.
From the Deck screen you can simply drag cards you want to remove to the Inventory section and vice versa. You must have at least 25 cards in your deck at all times. You can also recycle common cards for more power in the Recycle section.