(: Add or to your mana pool.)
Centaur Grave enters the battlefield tapped.
, , Sacrifice Centaur Grave: Destroy target artifact.
, Sacrifice a Swamp: Add to your mana pool.
: Add 
or 
to your mana pool.), , Sacrifice Centaur Grave: Destroy target artifact., Sacrifice a Swamp: Add to your mana pool.
