Sorcery, 3BB (5) Each player removes all creature cards in his or her graveyard from the game, then sacrifices all creatures he or she controls, then puts into play all cards he or she removed this way.1
Illus. Charles Gillespie
Both players remove their creature cards at once. Then both players sacrifice all creature they control at once. Then both players put all creatures they removed into play. If there are any choices involved for a given step, the current player makes their choices first, then the other player, and finally you do the action all at once. [D'Angelo 1999/08/31]
Both player's creatures from this are considered to enter play simultaneously. So if two of the same Legendary creature enter play, both will be put into the graveyard. [D'Angelo 1999/07/28]
The creatures which are put in the graveyard cannot be regenerated. [D'Angelo 1997/12/28]