pixeltris
Adding cards to collection
Not really sure if there's intention for this or not but I wanted to be able to add an archive of cards i have for testing but i don't see a way to do it through file editing. it'd be kind of laborious to do it one by one for a few hundred cards. for reference i have my collection saved from the ygoprodeck website. i didn't really know where else to ask this
There is no mechanism to do that. It's a suggestion I also would enjoy. I ended up writing a script to do it for me.
If you have them in YDKe format, you can copy that into a deck ingame, and then cheat to give yourself infinite Craft Points, and then batch generate the deck.
Thats what i did to easily to unlock only the pre-2004 cards
There currently isn't any ability do import a card collection. What @user18081972 suggested is probably the best way to do it right now.
Probably would be useful to have this functionality as either a command line to YgoMaster or some optional sub menu to the deck editor to import larger card collections.
I added a command line arg for this in YgoMaster.exe https://github.com/pixeltris/YgoMaster/blob/master/Docs/ImportingCardCollections.md
No in-game UI for it unfortunately but hopefully it's useful to someone. There's an example at the bottom of how to import all cards from GOAT format.