2v2, also known as 'Two Headed Giant' in other spaces, is a game where you and a teammate take on another team. In this, the score limit is first to 11 between the team, and there are three battlefields to control (the first player's battlefield is removed).
Players can play spells during their teammate's turn, and the turn order alternates between teams. So, first player will play, then an opponent, then that first player's teammate, then the second opponent.
Interestingly, the final point system is also different. A player must score each battlefield in the same turn to get the final point through conquer, except any that was occupied by an ally during that turn's beginning phase. This means that you'll essentially need to conquer any battlefield your team doesn't control.
