Gomaach Mountain

Gomaach Mountain does not untap during your
untap step. Untap Gomaach Mountain when you
cast a historic spell. (Artifacts, legendaries, and
Sagas are historic.)
{t}: Add two mana of any one color to your mana
pool. At the start of your end step the player that controls the legendary creature with the highest converted mana cost gains control of Gomaach Mountain.
Only the two most stubborn men in the world want
this mountain... This should end well.