Gwent has one of the best F2P models out there . It is quite generous in giving cards and even allows you to craft specific cards using scraps ( which you can get by destroying any extra cards you have). Gameplay wise I just love theorycrafting and deckbuilding aspect of it. They are decent in balancing the game.There can be some cards which can be absolutely broken, but get fixed after some time. HC also has certain issues with respect to it being a little slow, but they have made some improvements in recent patches and hopefully will continue to do so. And oh, the reward book system is just amazing.