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Gwent: Playing Thaler is a secondary quest in The Witcher 3: Wild Hunt.

Journal entry

Bernard Dukat, a.k.a. Thaler, was a truly great gwent player. What makes a gwent player great, you ask? Equal parts cunning and good cards, I reply. These last Geralt wanted for himself, for he felt his own collection was somewhat lacking.
As you might have guessed, Geralt managed to acquire Thaler's best card.