EDH with two teams of 3.
Commander where the general must be Standard-legal
Casual Formats from the mothership
intended to be unsolvable, this format requires both players to agree to battle for three turns at a time
Open a pack (don't look) and shuffle in 15 lands.
commons only
Modified life totals and banlist
Players prepare decklists of seven or fewer cards and games are deterministic.
The game has been played weekly on mtgsalvation (with a few interludes) since 2005.
EDH with six roles that have special missions.
Canadian Highlander
Similar to Commander but played with 50-card decks. No cards with casting cost greater than 3 are used.