Subtlety is a mythic Creature — Elemental Incarnation card from Special Guests (SPG), collector number 45. Current market price: $13.45 (foil $23.56), TCGplayer market prices via Scryfall.
Flash Flying When this creature enters, choose up to one target creature spell or planeswalker spell. Its owner puts it on their choice of the top or bottom of their library. Evoke—Exile a blue card from your hand.