(: Add or to your mana pool.)
Razorverge Bog enters the battlefield tapped.
, , Sacrifice Razorverge Bog: Prevent all combat damage that would be dealt this turn.
, Sacrifice a Swamp: Add to your mana pool.
: Add 
or 
to your mana pool.), , Sacrifice Razorverge Bog: Prevent all combat damage that would be dealt this turn., Sacrifice a Swamp: Add to your mana pool.
