Opening the Marketplace will launch the browser and take you to the dedicated Brave Frontier Versus Portal.
You can convert cards from your collection to NFTs in the Marketplace by spending Transfer Stones. Converting one card will consume one stone.
In the Marketplace, you can buy NFTs other players have listed or sell your NFTs to other players.
(A zkLogin account is needed to access the Marketplace.)
(Only cards with a grade of Foil or higher can be made into NFTs.)
(For more information on the Marketplace and its features, please see the help menu available on the associated web page.)