Elder Root Sanctuary

Elder Root Sanctuary enters the battlefield tapped unless you control a legendary creature.
{t}: Add one mana of any color.
{t}: Add two mana of any color combination. Only activate this ability if you control a creature with power 4 or greater. If you do, you gain 3 life.

If Elder Root Sanctuary would be destroyed, exile it instead. Return it to the battlefield untapped at the beginning of your next upkeep.