Liar's Pendulum | Magic: The Gathering
Formats Liar's Pendulum is Legal in
Official Oracle Text for Liar's Pendulum
Official Rulings for Liar's Pendulum
12/1/2004 : 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.
12/1/2004 : You reveal your hand only if you choose to, regardless of whether your opponent guessed right or wrong.
12/1/2004 : You can't draw a card if you don't reveal your hand.