(: Add or to your mana pool.)
Windswept Valley enters the battlefield tapped.
, , Sacrifice Windswept Valley: Prevent all combat damage that would be dealt this turn.
, , Sacrifice Windswept Valley: Destroy target artifact.
: Add 
or 
to your mana pool.), , Sacrifice Windswept Valley: Prevent all combat damage that would be dealt this turn., , Sacrifice Windswept Valley: Destroy target artifact.
