Historical Rules · 1 October 2009
Rule 119.2b
Official source text from the 1 October 2009 Rules release
If an effect instructs more than one player to draw cards in a Two-Headed Giant game, first the primary player (seated on the right) on the active team performs all of his or her draws, then the secondary player on that team performs all of his or her draws, then the nonactive team does the same.