Cheapest priced copy (Chronicles): $0.79 at Card Kingdom, near mint, their price list as of .
Petra Sphinx 
Creature — Sphinx · 3/4 · Rare · Legends · #30
{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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.79 to $15.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Chronicles Foreign Black Border | 10 | Rare | — | — |
| Chronicles | 10 | Rare | $0.79 | — |
| Legends | 30 | Rare | $15.99 | — |
One ruling from Wizards of the Coast
- 4 October 2004If the targeted player’s library is empty, that player still names a card, but nothing further happens. That player will not lose the game.