Last Resort

{5},{t} If another player attacks you, cast this at instant speed, when you do. Sacrifice one of your lands, and attacking player sacrifices all creatures. Exile 'Last Resort'.

{5},{t} Target player. Pick a basic land color they control on the battlefield, when you do, Exile all permanents of that color. Exile 'Last Resort.

"The Metal Beasts can't corrupt the land if it's a mile-wide crater" - General Washburn