Cunning Wish

Instant

You may reveal an instant card you own from outside the game and put it into your hand. Exile Cunning Wish.

2004-10-04:
Can’t acquire the Ante cards. They are considered still “in the game” as are cards in the library and the graveyard.
2007-05-01:
The choice is optional.
2007-05-01:
If you fail to find something, you still exile this.
2007-09-16:
Can’t acquire cards that are phased out.
2009-10-01:
You can’t acquire exiled cards because those cards are still in one of the game’s zones.
2009-10-01:
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.