Petra Sphinx [Legends] Predh destroy Cosmic Horror unless you

destroy Cosmic Horror unless you pay {3}{B}{B}{B}

Set: Urza's Legacy Type: Artifact Rarity: Rare Cost: {2} Each spell costs {3} more to cast except during its controller's turn

Whenever a Mountain enters the battlefield under your control

This is my destiny

Petra Sphinx [Legends] Predh destroy Cosmic Horror unless youSet: 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?