Kefnet the Mindful is a mythic Legendary Creature — God card from Amonkhet Promos (PAKH), collector number 59s. Current market price: — (foil $5.68), TCGplayer market prices via Scryfall.
Flying, indestructible Kefnet can't attack or block unless you have seven or more cards in hand. {3}{U}: Draw a card, then you may return a land you control to its owner's hand.