I've played witcher 3 for 1 week and gwent is the one that i love the most.But it's very unhappy that we can just take 1 card only from each merchant so this mod will help you can get unlimit card from merchants.Just play and try to win them,card will be yours reward.

Main mod:  Merchants will always give you 1 random card if you win them.Cards that can be given is default

Optional 1: Merchant can give you all cards in the game and no duplicates (by default they just can give you some common card that be defined).
For ex, if you won merchant A and he gave you BITING FROST,then he WONT give you BITING FROST anymore, just give you THE REST of cards that he didn't give. So if you want to get all cards,just play with merchant A till he not give you reward card. BUT if you play with another merchant (B), he still can gives you BITING FROST b/c he doesnt know another merchant had already given that card to you lol .

Optional 2: Everything is the same with Optional 1,except merchant will drop cards by default (not all cards). You can find the list cards merchants can drop at the end of this DESC.

IMPORTANT FOR OPTIONAL 1 & 2 :IF U ALREADY HAD ALL THE CARDS THAT A MERCHANT CAN DROP,YOU WONT RECEIVE ANY CARDS MORE FROM THAT MERCHANT EVEN YOU WIN HIM/HER.So you must find another merchant to deal for more cards
 
/////JUST INSTALL AND USE ONE MOD OF ABOVE !!!!//////
Installation:
Option 1 : download and install via The Witcher 3 Mod Manager
Option 2 : Manually download my mod,extract it into [your_game_folder]\Mods .If you dont have Mods folder,just create it.

Disclaimer: This mod works based on modified quest_function.ws . If you already using mods that modified quest_function.ws, pls use latest Witcher 3 Script Merger
 I recommend you use the main mod or the optional 2. Cause optional 1 can make the gwent game become too easy and just take a few hours to get all card in game.

//WORKING TO MAKE THE COMPLETE MOD THAT MERCHANTS ONLY DROP CARDS THAT YOU DONT HAVE(NEW CARD ONLY).BUT STUCK WHEN TRY TO GET CARDS PLAYER ALREADY HAD AND PUT THEM TO AN ARRAY.SO IF ANYONE KNOW HOW TO DO IT,PLS HELP.TY
 LIST CARDS DROP DEFAULT BY MERCHANT
gwint_card_fog
gwint_card_frost
gwint_card_rain
gwint_card_clear_sky
gwint_card_arachas_behemoth
gwint_card_assire
gwint_card_filavandrel
gwint_card_cahir
gwint_card_celaeno_harpy
gwint_card_ciaran
gwint_card_cockatrice
gwint_card_crone_brewess
gwint_card_dennis
gwint_card_dol_dwarf2
gwint_card_dol_dwarf3
gwint_card_dol_infantry2
gwint_card_dol_infantry3
gwint_card_elf_skirmisher2
gwint_card_elf_skirmisher3
gwint_card_emiel
gwint_card_endrega
gwint_card_fire_elemental
gwint_card_forktail
gwint_card_frightener
gwint_card_gargoyle
gwint_card_garkain
gwint_card_ghoul2
gwint_card_ghoul3
gwint_card_grave_hag
gwint_card_griffin
gwint_card_havekar_nurse
gwint_card_havekar_support2
gwint_card_ida
gwint_card_imlerith
gwint_card_kayran
gwint_card_toruviel
gwint_card_nekker3
gwint_card_philippa
gwint_card_plague_maiden
gwint_card_renuald
gwint_card_riordain
gwint_card_rotten
gwint_card_shilard
gwint_card_siege_tower
gwint_card_stefan
gwint_card_vanhemar
gwint_card_vattier
gwint_card_villen
gwint_card_vreemde
gwint_card_vrihedd_cadet
gwint_card_wyvern