Liar's Pendulum
Mirrodin — rare
Artifact
Liar's Pendulum rulings:
2004-12-01: First you name a card. Then the targeted opponent guesses whether the card is in your hand.
2004-12-01: After the opponent has guessed, you may reveal your hand. If your opponent was wrong, you draw a card. If your opponent was right, you don’t draw a card.
2004-12-01: You reveal your hand only if you choose to, regardless of whether your opponent guessed right or wrong.
2004-12-01: You can’t draw a card if you don’t reveal your hand.