Approach him and lay down a challenge in a game of Gwent, thus beginning the quest. After you collect all of the notices, you’ll see one that speaks of Vimme Vivaldi, the banker you can find on the west side of the same square. To begin this quest, visit the Notice Board found in Hierarch Square, the same place where you see two witches burned at the stake the first time you arrive. The quest you’ll need to complete in order to earn Ciri’s Gwent card is called Big City Players, which takes place in and around Novigrad. How to Unlock the Geralt of Rivia Gwent Card.
