CD Projekt Red has made Gwent: The Witcher Card Game available on Steam. Featuring full cross-play with players on iOS, Android, and GOG.com, Gwent on Steam also lets you carry over all your progress in the game from other platforms. And, of course, there are achievements and trading cards, which is the real reason to play on Steam.
In addition, players who have purchased the single-player Thronebreaker: The Witcher Tales on Steam can now earn rewards they can use in Gwent. These include two player avatars, two player titles, five premium kegs, and 20 new cards.