When Graven Crypt enters the battlefield, sacrifice it unless you pay 1 life.
: Add or to your mana pool.
: Graven Crypt becomes a 2/2 black Rat creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.
: Graven Crypt becomes a 2/2 black Rat creature until end of turn. It's still a land.
