Historical Rules · 1 October 2009
Rule 806.6d
Official source text from the 1 October 2009 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. Then the actions happen simultaneously.