If you're fan of Witcher and want to play Gwent. Then you're lucky.
Gwent is strategy game where you need patience and control. Here you have different fractions cards:
Monster, Skellige, Nilfgard, Northern Realms, Scoia'Tael and Syndicate. You can also mix up them all.
You fight 1v1, where you need to choose cards to win. To win you need to form combos of cards to get most points. You need to win 2/3 round.
Matchmaking is good, rounds time can be short or long, it depends on you and your opponent.
There are also different gamemodes with own mechanic.
My rating is 10/10.