Card Splitting is an option that is made available to you once you upgrade a card to the maximum rank of Infinity Rarity. The button you previously used to press to upgrade the card now has a notification prompt on it to "split the card" - if you do this, you'll gain a duplicate of the card in your collection, but it will be back at the uncommon rank, with a brand new different background! This allows you to upgrade this card to maximum rank and split it again, over and over, creating many new versions of the same card. Some backgrounds, like Inkify or Gold, are much rarer than others, and offer an incentive to keep splitting your cards! Check out our detailed guide on Infinity Splitting. A "Gold Background" split [card name="Angela"] can be seen here.