Certainly a good idea, but a few things would need to be done:
1) Maybe someone can make Zanz a mock-up screen? It would be hard to fit everything on with the current set-up
2) Rules (who goes first? What about decking your opponent? Defeat both people, or just one?)
3) Shared space? Or each person gets their own full space? (E.g. 1 section for whole team pillars, or 1 sections for each player's pillars?)
Personally, I'd say each player is dealt 4 cards to start and both share the same life bar (200 life). The coin toss at the start determines which team starts first, then there's a toss in the team to see who goes first. Then matches would go like this:
Team 1, player 1
Team 2, player 1
Team 1, player 2
Team 2, player 2
repeat
A lot of things should be shared: Creature space, pillar space, quanta. This would probably address many of the screen layout issues that would be faced.
Decking one opponent should not mean defeat for the whole team. Instead, that one person loses and is given the option to watch the remaining match, or simply leave and do something else.
However, I do see some problems:
1) My team mate leaves straight away, leaving me to face 2 opponents right from the start.
2) My team mate does nothing.
3) Connection issues
4) Team communication
But, if all these things can be addressed, I'd love to see 2v2 come in