Smokestack

Destroy all lands.

You destroy four lands you control, then target opponent destroys four lands they control. Then Burning of Xinye deals 4 damage to each creature.

Each player chooses from among the permanents they control an artifact, a creature, an enchantment, and a land, then sacrifices the rest.

Trample When Child of Alara dies, destroy all nonland permanents. They can't be regenerated.

Exile all artifacts, creatures, and lands from the battlefield, all cards from all graveyards, and all cards from all hands. Cycling 5RR (5RR, Discard this card: Draw a card.) When you cycle this card, destroy all lands.

Firespout deals 3 damage to each creature without flying if R was spent to cast this spell and 3 damage to each creature with flying if G was spent to cast this spell. (Do both if RG was spent.)

Destroy all artifacts and enchantments. You gain 2 life for each permanent destroyed this way.

Each player exiles all creature cards from their graveyard, then sacrifices all creatures they control, then puts all cards they exiled this way onto the battlefield.