When Graven Tomb enters the battlefield, sacrifice it unless you pay .
: Add to your mana pool. Graven Tomb doesn't untap during your next untap step.
: Graven Tomb becomes a 2/2 red Giant creature until end of turn. It's still a land.
.
: Add 
to your mana pool. Graven Tomb doesn't untap during your next untap step.
: Graven Tomb becomes a 2/2 red Giant creature until end of turn. It's still a land.
