Purity is a rare Creature — Elemental Incarnation card from Lorwyn (LRW), collector number 37. Current market price: $2.58 (foil $13.19), TCGplayer market prices via Scryfall.
Flying If noncombat damage would be dealt to you, prevent that damage. You gain life equal to the damage prevented this way. When Purity is put into a graveyard from anywhere, shuffle it into its owner's library.