Petra Sphinx

Creature - Sphinx 3/4, 2WWW (5)
{T}: Target player names a card, then reveals the top card of his or her library. If that card is the named card, that player puts it into his or her hand. If it isn't, the player puts it into his or her graveyard.¹
What walks on four legs in the morning, two legs in the afternoon, and three legs in the evening?
Illus. Sandra Everingham

Gatherer Card Rulings [Nov 2009]

• 10/4/2004: If the targeted player's library is empty, that player still names a card, but nothing further happens. That player will not lose the game.

Format Legality	Legal in Vintage, Legacy Banned in Extended, Standard
Printings (2/3)	Chronicles (Rare) Legends (Rare)