Bontu's Last Reckoning

Oracle Text
Destroy all creatures. Lands you control don't untap during your next untap step.
Card Rulings
7/14/2017 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.
7/14/2017 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.
among other responses, you could rely on that or even bounce something till end of turn and wipe the field, leaving you with a creature.
not to mention the fact that its just lands tapped, if this tapped all of your lands, that'd be one thing, but unless things have really gone upside down, you'd probably be using this as a last resort later in the game when 3 mana isn't that huge of a loss.
I will certainly consider this card when I look at black boardwipes from now on.
I think despite the text here, this is actually Bontu fighting for Amonkhet and the Gatewatch against Bolas' Eternalized Zombie Apocalypse. Bontu probably feels particularly betrayed being initially maybe the most loyal of the God-Pharoah's subjects. Possibly Bontu knew the name Nicol Bolas but didn't know what the Hour of Devastation would completely entail. Hazoret is certainly going to switch sides to good, and probably Kefnet too, because Kefnet got hurt the last time Bolas arrived to devastate Amonkhet.
Oketra ''the True'' is likely also a good God. Bolas is bringing Three New Gods with him though, so I think he's planning for 3 Gods to betray him.
Hazoret, Kefnet, and Oketra are three, but one of them could be Really Evil, leaving either Bontu or Rhonas to have a surprising change of heart.
Well, that's how I'd play it if I were the storytellers. I guess we will see.