Free-for-All

Enchantment -
When Free-for-All enters the battlefield, exile all creatures face down. <CR>
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. <CR>
When Free-for-All leaves the battlefield, put all cards exiled with it into their owners' graveyards.

Enchantment -
When Free-for-All enters, exile all creatures face down. <CR>
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. <CR>
When Free-for-All leaves the battlefield, put all cards exiled with it into their owners' graveyards.

Enchantment -
When Free-for-All comes into play, set aside all creatures in play, face down. <CR>
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. <CR>
If Free-for-All leaves play, put each creature still set aside this way into its owner's graveyard.

Enchantment -
When Free-for-All enters the battlefield, exile all creatures face down. <CR>
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. <CR>
When Free-for-All leaves the battlefield, put all cards exiled with it into their owners' graveyards.