Petra Sphinx [Legends] Timeless This card is named My

This card is named My First Tome

If you control an Urza's Power-Plant and an Urza's Tower

Set: Arabian Nights Type: Artifact Creature — Spirit Rarity: Rare Cost: {4} Flying (This creature can't be blocked except by creatures with flying or reach

{T}: Add {W} or {B}

To our horror

Petra Sphinx [Legends] Timeless This card is named MySet: Legends Type: Creature Sphinx Rarity: Rare Cost: {2}{W}{W}{W} {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. What walks on four legs in the morning, two legs in the afternoon, and three legs in the evening?