Sunscour

You may pay rather than pay this spell's mana cost.

If the cost was paid, an opponent chooses up to two nonland permanents they control and returns them to their owner's hand.

Destroy all nonland permanents.

You may pay and tap four untapped creatures you control with flying rather than pay this spell's mana cost.

Flying, lifelink

Other creatures you control with flying have indestructible. (Damage and effects that say "destroy" don't destroy them.)

Exile the top five cards of your library. An opponent separates those cards into two piles. You may play lands and cast spells from one of those piles. If you cast a spell this way, you cast it without paying its mana cost.

Destroy all creatures. They can't be regenerated.

Threshold — If there are seven or more cards in your graveyard, instead destroy all creatures, then create two 1/1 white Spirit creature tokens with flying. Creatures destroyed this way can't be regenerated.

This spell costs less to cast for each creature on the battlefield.

Destroy all creatures.

Destroy all nonwhite creatures.