When Grave Sea enters the battlefield, sacrifice it unless you pay .
: Add to your mana pool. Return Grave Sea to its owner's hand.
Morph (You may cast this face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
.
: Add 
to your mana pool. Return Grave Sea to its owner's hand.
(You may cast this face down as a 2/2 creature for 
. Turn it face up any time for its morph cost.)
