Gwent is a reimplementation of my favourite boardgame ever: Condottiere
Major source they drew from, for sure, alongside Netrunner. Result was one of the best minigames ever. Sadly, the versions they've done as stand-alone games are pretty boring - added a lot of traditional CCG elements that make it over complicated and boring.
I think what made it so great in TW3 was the drip-drop introduction of cards that slowly built up the engines in the decks through the gameplay missions and exploration.
Major source they drew from, for sure, alongside Netrunner. Result was one of the best minigames ever. Sadly, the versions they've done as stand-alone games are pretty boring - added a lot of traditional CCG elements that make it over complicated and boring.