To generate json file:

bundle install
bundle exec bin/build_jsons decks.json

To add new decks from new set:

• add set code to lib/sets.rb (running rake sets does it automatically if it's already in magic-search-engine's index)
• use url2txt from taw/mtg repo to fetch decklists
• move decklists to right repository
• use bundle exec bin/build_jsons decks.json to validate