Oathbreaker is a 58-card singleton Magic: the Gathering format. Unlike Commander, each deck starts with an Oathbreaker Planeswalker and a Signature Spell instant/sorcery in the command zone. You can read more on the Weirdcards website, including rules, ban list, and philosophy. EDHREC data (including Oathbreaker) comes from Archidekt, DeckStats, and MTGGoldfish. Your deck will be automatically scraped if it is legal and publicly visible.