Morzzfang's Cathedral

This land comes into play tapped unless you control another legendary land.
{t} for {w}{w} or {b}{b}
{t}, If Morzzfang the Profane is on the battlefield, you may sacrifice a black/white human creature and perform reviving ritual. (Have a demon from your graveyard fight target creature.) Exile the demon after the fight is resolved.
—In this cathedral, the most unhallowed of acts are encouraged.