Numot, the Devastator

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

Armageddon

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

Whenever a player taps a land for mana, if it's not that player's turn, destroy that land.

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