The Sun Temple's Valley

The Sun Temple's Valley enters the battlefield
tapped.
{t}: Add {b}{r}{g}. Spend this mana only to cast
non commander creature spells. If you would
lose any of this mana The Sun Temple's Valley
deals 5 damge to you.
When you tap The Sun Temple's Valley for
mana it does not untap during you next untap
step and can only untap during your untap step.