Unholy Gate

If Unholy Gate is in your opening hand, you may
begin the game with it on the battlefield.
Your graveyard can't be exiled. Cards in your graveyard can't be exiled.
Cards put into your graveyard can't be exiled.
{t}, Sacrifice Unholy Gate: Exile target player's graveyard.
{5}{b}{b}, {t}, Sacrifice Unholy Gate: Until end of
turn, you may cast spells from among cards you
own in exile.