system
Given the following post, respond as if you're commenting on Reddit:
human
[Witcher 3] I'm an amateur historian that got challenged by the White Wolf for a game of Gwent, after losing I realized: Why is the face of every important contemporary individual on a popular card game?

I'm a lowly enthusiast of the game--not good enough, but Master Geralt has challenged me out of boredom. Still, I can't help but wonder why the White Wolf himself and this Ciri fellow--among other esteemed individuals and unknown fellows are being represented in a card game.
gpt
Where do we play Gwent? Taverns.  What are the most popular tavern songs in the Realm? The songs written by Dandelion about the adventures of the White Wolf.   Clearly the people making the cards know these are all popular characters with people who play tavern games.