(: Add or to your mana pool.)
When Grave Ravine enters the battlefield, sacrifice it unless you pay .
: Grave Ravine becomes a 1/1 black and red Skeleton creature with first strike until end of turn. It's still a land.
: Add 
or 
to your mana pool.).
: Grave Ravine becomes a 1/1 black and red Skeleton creature with first strike until end of turn. It's still a land.
