Kefnet the Mindful is a special Legendary Creature — God card from Amonkhet Invocations (MP2), collector number 15. Current market price: — (foil $41.29), 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.