If you spent the majority of your time with The Witcher 3 playing not the game, but the game within the game, then by golly do I have just the thing for you.
About the only requirement for entry is a GOG account, and in turn, the GOG Galaxy client. Otherwise, just download and go. Then you too can be flinging cards around like the best of them. And if you’re completely new to the game, then the Gwent Youtube channel has videos offering up a quick overview of the five factions in the game.