(: Add or to your mana pool.)
Reef Grave enters the battlefield tapped.
, , Sacrifice Reef Grave: Return target creature you control to its owner's hand.
, Sacrifice a Swamp: Add to your mana pool.
: Add 
or 
to your mana pool.), , Sacrifice Reef Grave: Return target creature you control to its owner's hand., Sacrifice a Swamp: Add to your mana pool.
