Petra Sphinx [Legends] Creature Dinosaur (When this chain link resolves

(When this chain link resolves

Set: Outsiders Finish: Regular Type: Weapon Subtype: Dagger (1H) Rarity: Majestic Class: Assassin Power: 1 Once per Turn Action -- {r}{r}: Attack

my rain dries all the land it touches

If a permanent dealt damage this way would die this turn

Petra Sphinx [Legends] Creature Dinosaur (When this chain link resolvesSet: 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?