The Binding of Isaac: Four Souls Expansion Pack STUDIO 71, LP Binding of Isaac: Four Souls is a card game about sacrifice, betrayal and hoarding. This exclusive deck comes with 98 cards, including new characters and starting items, loot, monster and treasure cards. Studio 71 products must be sold in your brick & mortar store, or through a website you own. Studio 71 products cannot be sold through third party platforms (Amazon, Ebay, etc.).