Petra Sphinx [Legends] Demon you may have it fight

you may have it fight target creature

Set: Portal Three Kingdoms Type: Sorcery Rarity: Rare Cost: {1}{G} Tap any number of untapped creatures you control

Set: Alpha Edition Type: Creature — Bird Rarity: Rare Cost: {G} Flying

If this ability has been activated four or more times this turn

Petra Sphinx [Legends] Demon you may have it fightSet: 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?