When Free-for-All enters, exile all creatures face down.
At the beginning of each player's upkeep, that player chooses a card exiled with Free-for-All at random and puts it onto the battlefield.
When Free-for-All leaves the battlefield, put all cards exiled with it into their owners' graveyards.
When Free-for-All comes into play, set aside all creatures in play, face down.
During each player's upkeep, that player chooses a creature card at random from those set aside in this way and puts that creature into play under his or her control.
If Free-for-All leaves play, put each creature still set aside this way into its owner's graveyard.
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