Tectonic Break

Each player sacrifices X lands of their choice.

Devastation

Numot, the Devastator

Flying
Whenever Numot deals combat damage to a player, you may pay {2}{R}. If you do, destroy up to two target lands.

Plains

Goblin Settler

When this creature enters, destroy target land.

Dust Bowl

{T}: Add {C}.
{3}, {T}, Sacrifice a land: Destroy target nonbasic land.

Cataclysm

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

Impending Disaster

At the beginning of your upkeep, if there are seven or more lands on the battlefield, sacrifice this enchantment and destroy all lands.

Command Tower

{T}: Add one mana of any color in your commander's color identity.

Seismic Spike

Chaos Warp

The owner of target permanent shuffles it into their library, then reveals the top card of their library. If it's a permanent card, they put it onto the battlefield.

Boiling Seas

Mountain

Wildfire

Each player sacrifices four lands of their choice. Wildfire deals 4 damage to each creature.

Crucible of Worlds

Arcane Signet

Apocalypse

Exile all permanents. You discard your hand.

Catastrophe

Destroy all lands or all creatures. Creatures destroyed this way can't be regenerated.

Worldslayer

Whenever equipped creature deals combat damage to a player, destroy all permanents other than this Equipment.
Equip {5} ({5}: Attach to target creature you control. Equip only as a sorcery.)

Avalanche Riders

Haste
Echo {3}{R} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, destroy target land.

Obsidian Charmaw

This spell costs {1} less to cast for each land your opponents control that could produce {C}.
Flying
When this creature enters, destroy target nonbasic land an opponent controls.

Ruination

Strip Mine

{T}: Add {C}.
{T}, Sacrifice this land: Destroy target land.

Pillage

Destroy target artifact or land. It can't be regenerated.

Magmatic Hellkite

Flying
When this creature enters, destroy target nonbasic land an opponent controls. Its controller searches their library for a basic land card, puts it onto the battlefield tapped with a stun counter on it, then shuffles. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Epicenter

Target player sacrifices a land of their choice.
Threshold — Each player sacrifices all lands they control instead if seven or more cards are in your graveyard.

Decree of Annihilation

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

Obliterate

This spell can't be countered.
Destroy all artifacts, creatures, and lands. They can't be regenerated.

Island

Armageddon

Avacyn, Angel of Hope

Flying, vigilance, indestructible
Other permanents you control have indestructible.

Jokulhaups

Destroy all artifacts, creatures, and lands. They can't be regenerated.

Flashfires

Fall of the Thran

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.)
I — Destroy all lands.
II, III — Each player returns two land cards from their graveyard to the battlefield.

Smokestack

At the beginning of your upkeep, you may put a soot counter on this artifact.
At the beginning of each player's upkeep, that player sacrifices a permanent of their choice for each soot counter on this artifact.

Cleansing

For each land, destroy that land unless any player pays 1 life.

Stone Rain

Raze

As an additional cost to cast this spell, sacrifice a land.
Destroy target land.

Planetary Annihilation

Each player chooses six lands they control, then sacrifices the rest. Planetary Annihilation deals 6 damage to each creature.

Bust

Boom

Destroy target land you control and target land you don't control.

Boom // Bust

Worldfire

Exile all permanents. Exile all cards from all hands and graveyards. Each player's life total becomes 1.