Extinction

Exile each creature on the battlefield and return each Planeswalker to their owner's hands. Each other nonland permanent is destroyed. Then
each player searches their hand, library, and graveyard and exiles all other creatures that share
a name with creatures exiled in this way.
In case they could not stop the Eldrazi, Jace, Chandra, and Nissa constructed a failsafe to ensure that they would never bring another plane to its end. That failsafe has gone missing...