At the start of your opponent's turn, they are asked "What about a round of gwent?" and can choose to Accept or Decline. If they Decline, reduce this card's strength by 5. If they Accept, start a new game using the decks both players started with respectively that only has one round. When that game ends, restore the game in the state it was left in when opponent chose to Accept, then the winner of that game gains control of Geralt: Gwent Master. If it ended in a tie, you keep control of Geralt: Gwent Master