To generate json file:

bundle install
bundle exec bin/build_jsons decks.json

Adding new sets

To add new decks from new set:

• use url2txt from taw/mtg repo to fetch decklists
• move decklists to right repository
• use bundle exec bin/build_jsons decks.json to validate file structure
• use bundle exec bin/validate_card_names to validate card names

CI will do validation for you if you open a PR.