The Obelisk Of Brofora

The Obelisk of Brofora enters the battlefield tapped unless you have 10 or less life.
{1}, {t}: add {g/w}{g/w}{g/w}. (You may spend {g/w} to pay for costs with {g} or {w} in them)
{g/w}{g/w}, {t}: Prevent the next 10 damage that would be dealt to you from any one source.