Arbiter of the Ideal is a rare Creature — Sphinx card from Born of the Gods Promos (PBNG), collector number 31★. Current market price: — (foil $0.43), TCGplayer market prices via Scryfall.
Flying Inspired — Whenever this creature becomes untapped, reveal the top card of your library. If it's an artifact, creature, or land card, you may put it onto the battlefield with a manifestation counter on it. That permanent is an enchantment in addition to its other types.