Trading cards have been popular long before digital worlds were even imagined. Until recently, challenges around authenticating digital items made it nearly impossible to create scarcity (and therefore value) for digital trading cards. Today crypto, (and the underlying blockchain technology) makes authenticating digital trading cards possible.
Sorare uses blockchain technology to build a digital fantasy football league, where users collect, trade and compete with their favourite player's cards (NFTs). Users play fantasy football with these player cards and earn real world rewards based on the performance of their players in real world competitions.