Historical Rules · 1 April 2011
Rule 103.5a
Official source text from the 1 April 2011 Rules release
In a multiplayer game using the shared team turns option, first each player on the starting team, in whatever order that team likes, may put any or all such cards onto the battlefield from his or her opening hand. Teammates may consult while making their decisions. Then each player on each other team in turn order does the same.