Carde.io Auth Key Information All players must create a Carde.io account on the Riftbound OP website. Players must connect their Riot account to their Carde.io account to participate in Riftbound events. For a successful Riftbound: League of Legends TCG Proving Grounds Riot Games Store Riftbound's First English Regional Qualifier (and other OP Updates!) ATTENTION ALL RIFTBOUND PLAYERS! For playing in tournaments make sure that you do the following: Create a Riot Account: If you don't already have one, visit the official Riot Games account management