So you have a team of 3 vs a team of 3. Each team member brings one deck. They play their deck first against one of the three and everything is recorded. Who won the coin toss, the specific 10 cards, the cards that were on the top for the Mulligan's, and the specific card draws at the end of the round. The match is played and then when everyone is finished, the boards are exchanged with the same cards but an inverse coin flip result. In other words every aspect will be the same as your teammate played it except if he went first, you go second. You try with your teammates deck against your opponents teammates deck, with every card and the deck positioning being identical. You play all the three hands and calculate wins. It basically boils down to a best of 9 (3 games per team member.) Also you could give individual awards to one player if they manage to sweep all 3 games.
