When Watery Crypt enters the battlefield, sacrifice it unless you pay .
: Add to your mana pool. Return Watery Crypt to its owner's hand.
: Watery Crypt becomes a 1/1 blue and black Crab creature with flying until end of turn. It's still a land.
.
: Add 
to your mana pool. Return Watery Crypt to its owner's hand.
: Watery Crypt becomes a 1/1 blue and black Crab creature with flying until end of turn. It's still a land.
