Historical Rules · 23 April 2010
Rule 806.7b
Official source text from the 23 April 2010 Rules release
The Active Player, Nonactive Player order rule (see rule 101.4) is modified for Two-Headed Giant play. The team whose turn it is is the active team. The other team is the nonactive team. If both teams would make choices and/or take actions at the same time, first the active team makes any choices required, then the nonactive team makes any choices required. If each player would make choices and/or take actions at the same time, first each player on the active team makes any choices required in whatever order they like, then the players on the nonactive team do the same. Once all choices have been made, the actions happen simultaneously.