The Rockhound excavator was powered by four nuclear reactors and proved to be ... too efficient. Its mining efforts devastated the area and transformed the land into the Ash Heap.

Tainted Peak

{T}: Add {C}.
{T}: Add {B} or {R}. Activate only if you control a Swamp.

ocT: Add one colorless mana to your mana pool.
ocT: Add {B} or {R} to your mana pool. Play this ability only if you control a swamp.

Duskmourn: House of Horror Commander

Modern Horizons 3 Commander

Outlaws of Thunder Junction Commander

Fallout

Crimson Vow Commander

Forgotten Realms Commander

{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast an artifact spell.
{3}, {T}, Sacrifice an artifact: Create a 3/3 colorless Robot Villain artifact creature token named Doombot. Activate only as a sorcery.