Hokori, Dust Drinker

Lands don't untap during their controllers' untap steps.
At the beginning of each player's upkeep, that player untaps a land they control.

Winter Orb

As long as this artifact is untapped, players can't untap more than one land during their untap steps.

Ravages of War

Ruination

Bust

Boom

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

Boom // Bust

Crucible of Worlds

Catastrophe

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

Wildfire

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

Armageddon

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.

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.