Should I buy every Gwent Card I come across

[Viper]

At merchants...if I want to collect them all. Or can I complete my collection just by playing matches.

[Barley]

Buy em all if ya got tha coinn

[Censored]

No you can't you gotta buy them and win them.

here hope this helps

http://steamcommunity.com/sharedfiles/filedetails/?id=452592571

[A MASSIVE SPLIFF]

yes

[Moon Punisher]

I really dont think you can get every card just by playing matches , still you can get multiple of some cards.

I would buy it all just to be safe , since i dont imagine you will find a list with exactly which cards and how many you can get at each source.

[Packetstorm]

Buy all the cards a merchant is selling. Check every merchant you come across. Also, check if you can play against them. Follow the Gwent quests to win special cards. gwentcards(dot)com is a good place to keep track of your collection.