Flying, indestructible
Kefnet the Mindful can’t attack or block unless you have seven or more cards in hand. : Draw a card, then you may return a land you control to its owner’s hand.
Once Kefnet has attacked or blocked, it will remain in combat even if the number of cards in your hand becomes six or fewer.
18-04-2017
wotc
While resolving Kefnet's activated ability, you don't choose which land to return to its owner's hand (or whether you'll return one at all) until you see the card you draw.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.