Duplicity

Enchantment    (CMC:5)

When Duplicity comes into play, put the top five cards of your library face down on Duplicity. During your upkeep, you may exchange all the cards in your hand for the cards on Duplicity. At the end of your turn, choose and discard a card. If you lose control of Duplicity, put all cards on it into owner's graveyard.

TE • ENDan Frazier

™ & © 1993—1997 Wizards of the Coast

Legal in: Tempest Block,Legacy,Vintage,Commander

Oracle Text (click to copy):

Duplicity {3}{U}{U} Enchantment When Duplicity enters the battlefield, exile the top five cards of your library face down. At the beginning of your upkeep, you may exile all cards from your hand face down. If you do, put all other cards you own exiled with Duplicity into your hand. At the beginning of your end step, discard a card. When you lose control of Duplicity, put all cards exiled with Duplicity into their owner's graveyard.

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View this MTG card on Gatherer

10/4/2004
The cards are face down all the time. You can't look at them. This applies even to cards from your hand that got swapped out. You have to remember what they were if you care.
4/1/2008
For a time the last ability triggered when Duplicity left the battlefield. It has been restored to triggering when you lose control of Duplicity.
4/1/2008
Taking control of another player's Duplicity will trigger the ability that causes the cards they exiled to be put into their owner's graveyard.

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Card Duplicity is not on TCGPlayer.