Purify the World

When you cast this spell, destroy all non-land,
non-white permanents.
Whenever a land becomes tapped, it does not
untap during its controller's next untap step.
{2}{w}{w}: Each player chooses a legendary
permanent in their graveyard. You may return
those permanents to the battlefield. Activate
this ability only as a sorcery and only once per
turn.