The Nirgothian Cathedral

The Nirgothian Cathedral enters the battlefield tapped, unless you control at least three Clerics.
Whenever you tap a land you control for mana,
you gain 1 life for each mana that land produces.
{t}: Add {w}.
Only rivalled in size and importance by the Hallowed Bastion in Hallowspire, the Nirgothian cathedral
stands as a testament to the devotion of the masses.