Halls of the Dreadnaught

Halls of the Dreadnaught enters the battlefield
tapped unless you control Oryx, the Taken King.
{t}: {b}{b}{g}{g}
{t}{b}{b}{b}{g}{g}{g}: Sacrifice Halls of the
Dreadnaught. Create eight black 3/3 Taken
Thrall. Add {b}{b}{g}{g}.