https://www.playgwent.com/
(https://www.playgwent.com/img/screenshots/Your_hand_2.29.jpg)
Due to the massive popularity of Gwent in the Witcher: Wild Hunt, CD Project Red recently moved Gwent from closed to open Beta - free to play with a actually good f2p system unlike heartstone.
I personally, had a lot of fun with it, but found myself annoyed by some balance issues and certain deck archtypes being very common, but there is plenty of potential in the game.
If you sign up over gog you get a free keg, btw.
Aye, Gwent is fun and I play it from time to time.
I usually play a Skellige deck with Bran Turiseach as the commander, play him early to dump my 3 Drummond Queensguard into the graveyard (and boost them), then spend the rest of the first round thinning my deck and boosting the cards in the graveyard. Later on I bring 'em back with Priestesses of Freya and Sigrdrifa, the Queensguard are especially potent since they resurrect all copies of QG when one is brought into play.
1 Bran Tuirseach
1 Draig Bon-Dhu
1 Holgar Blackhand
1 Seigfrida
1 Decoy
1 White Frost
3 Dimun Pirates
1 Haeymaey Flaminca
1 Tuirseach Skirmisher
1 Drummond Warmonger
3 Drummond Queensguard
3 Priestess of Freya
3 Tuirseach Bearmaster
1 Azur's Thunder
2 First Light
1 Reconnaissance
1 Golden Froth
Granted, the deck isn't really meta (and I'd rather replace Tuirseach Skirmisher with Cerys An Crait), but it's a fun deck IMO.
I just hope that the upcoming redesign (think it releases in October) works out well.