This console gives you one of each Gwent Card, aside from the Vampire: Katakan Card. You can add the Vampire: Katakan Card with the additem('gwint_card_katakan') command.
The syntax for the addgwintcards command is as follows:
addgwintcards
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addgwintcards
This is the only way to use the addgwintcards console command. After executing this command, you'll be given one of each Gwent Card (excluding the Vampire: Katakan Card).