Petra Sphinx [Legends] Judge Gift Cards 2007 It has "This creature's power

It has "This creature's power and toughness are each equal to the number of experience counters you have

This timeworn relic was responsible for many of Urza's victories

Mill two cards

If it's a land card

{T}: Put up to X +1/+0 counters on Clockwork Avian

Petra Sphinx [Legends] Judge Gift Cards 2007 It has "This creature's powerSet: Legends Type: Creature Sphinx 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?