Petra Sphinx — ruling 1

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.

Petra Sphinx : règles, fonctionnement et interactions (MTG)

Petra Sphinx is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

: 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.

How it works : Petra Sphinx

Original English text — Wizards of the Coast / Scryfall

#1October 4, 2004· Wizards of the Coast
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.
No other card is named in this ruling.