Can I sell or swap Gwent cards?

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I own multiple Gwent cards of the same type. How can I sell them or swap them for other cards?
How can I prevent to buy Gwent cards that I already have in my collection?
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Should I buy Gwent cards I already have?
Yes, buy all good cards you see, multiple copies of a good card in your deck is a good thing. For some cards, like Blue Stripes Commando, it's even necessary to have as many copies of them as you can for them to be effective, since they have an ability which boosts them if you have several of them in play.Is there a penalty for losing Gwent?
You don't lose any cards when losing to your opponent, only coin. Your first win against any opponent gives you a card, every consecutive win gives you a random crafting material and coin, of course. Playing with a NPC not related to a Gwent quest can make you maximum of 10 crowns per won game.Can you win more than one Gwent card from the same person?
The total number of gwent cards you can win from merchants is limited, and you can only win one card from each merchant.Can you make money from Gwent?
You can make a gwent deck where you reliably win more than 95% of the matches, so you can use gwent to make money. Just not more than while looting and questing.Witcher 3: All Purchasable Gwent Cards, All Gwent Cards You Can Buy, Trader Locations.
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Images: Karolina Grabowska, Karolina Grabowska, Sora Shimazaki, Max Fischer