(Ravaged Barrens isn't a spell.)
Ravaged Barrens enters the battlefield tapped.
: Target player exiles a card from his or her graveyard.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
: Target player exiles a card from his or her graveyard.: Add 
to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
