4 Oct 2004
Can't acquire the Ante cards. They are considered still "in the game" as are cards in the library and the graveyard.
16 Sept 2007
Can't acquire cards that are phased out.
1 Oct 2009
You can't acquire exiled cards because those cards are still in one of the game's zones.
1 Oct 2009
In a sanctioned event, a card that's "outside the game" is one that's in your sideboard. In an unsanctioned event, you may choose any card from your collection.