Magic: The Gathering officially recognizes a new multiplayer format, Oathbreaker

polygon.com:

Magic: The Gatheringpublisher Wizards of the Coast has officially recognized a new fan-made format called Oathbreaker. The format accommodates 3-5 players, and was invented by a gaming Minnesota-based group called Weirdcards Charitable Club. A new landing page is now live, and provides additional details on the format.

You might be surprised to learn that there’s more than just one way to play Magic, the classic collectible card game that launched in 1993. As of March 15 there are actually 23 in all, but most players are drawn to one of three different formats — Standard, Booster Draft, and Commander. Commander, the game’s premiere multiplayer format, has long been considered the most popular way to play Magic. As such, Oathbreaker could significantly expand its appeal for casual groups.

To create an Oathbreaker deck, players must assemble a 60-card deck and build it around their favorite planeswalker — powerful characters from the Magic universe. According to the Magic website, decks must not contain duplicate cards. Additionally, players must select a so-called “signature spell,” which must match the color identity of their Oathbreaker planeswalker card. Both the planeswalker and the signature spell start the game in-play, and players then battle from there to reduce the other opponents at the table from a starting value of 20 life.

From the official description:

If your Oathbreaker is on the battlefield under your control, you can cast your Signature Spell for its normal costs, plus an additional two mana for each previous time you’ve cast your Signature Spell from the command zone this game. When your Signature Spell resolves, put it into the command zone instead of your graveyard. If your Signature Spell would go