Graven Grave enters the battlefield tapped unless you sacrifice a Black permanent.
: Add or to your mana pool.
Sacrifice Graven Grave: Add or to your mana pool.
, Sacrifice Graven Grave: Add to your mana pool.
: Add 
or 
to your mana pool. or to your mana pool., Sacrifice Graven Grave: Add 
to your mana pool.
