Petra Sphinx [Legends] Timeless {T}: Add {W} or {B}

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

Sacrifice this artifact: Add one mana of any color

defending player sacrifices four permanents

Set: Limited Edition Beta Type: Creature — Human Knight Rarity: Rare Cost: {2}{W}{W} {W}{W}

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

Petra Sphinx [Legends] Timeless {T}: Add {W} or {B}Set: 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?