Organic Extinction

Destroy all nonartifact permanents.

Destroy all creatures with power 3 or greater.

Convoke (Your creatures can help cast this spell. Each creature you tap while casting this spell pays for or one mana of that creature's color.)

Exile all creatures except those that share a creature type with a creature that convoked this spell, all artifacts, and all enchantments.

Create X 1/1 white Pegasus creature tokens with flying, where X is your life total.

Return all artifact, enchantment, and planeswalker cards from your graveyard to the battlefield.

When you unlock this door, destroy all creatures with power 3 or greater.

(You may cast either half. That door unlocks on the battlefield. As a sorcery, you may pay the mana cost of a locked door to unlock it.)