Bontu's Last Reckoning

• WWizards of the Coast2017-07-14
  Official Ruling
  No lands that you control will untap during your next untap step, even lands that aren’t tapped as this spell resolves. This includes lands that enter the battlefield after this spell resolves.
• WWizards of the Coast2017-07-14
  Official Ruling
  If more than one spell says that lands you control don’t untap during your next untap step, the effects will all wear off during that untap step. You’ll untap lands you control during your untap step after that one.

Rulings via Scryfall