The Mistbark Mountains

{t}: Add one mana of any color
{t}: Add two mana of any color; The Mistbark Mountains don't untap during your next untap
step.
{x}{t}: Exile any number of permanents with
total mana value {x}. Exile the Mistbark
Mountains.
No one knows where they went, but their mark on
history is undeniable.