(: Add or to your mana pool.)
When Graven Swamp enters the battlefield, sacrifice it unless you pay 3 life.
, Sacrifice Graven Swamp: Graven Swamp deals 1 damage to target creature or player.
: Add 
or 
to your mana pool.), Sacrifice Graven Swamp: Graven Swamp deals 1 damage to target creature or player.
