What walks on four legs in the morning, two legs in the afternoon, and three legs in the evening?

Sfinge di Petra

Petra Sphinx

{T}: Target player chooses a card name, then reveals the top card of their library. If that card has the chosen name, that player puts it into their hand. If it doesn't, the player puts it into their graveyard.

Masters Edition

{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.

Chronicles Foreign Black Border

Chronicles

oc
T: Target player names a card and then turns over the top card of his or her library. If it is the card named, put it into that player's hand. Otherwise, put it into the player's graveyard.

Legends

oc
T: Target player names a card and then turns over the top card of his or her library. If it matches the named card, the card is put in the player's hand; otherwise it is put into the graveyard.

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.