(: Add or to your mana pool.)
When Graven Barrens enters the battlefield, sacrifice it unless you pay .
: Put a 1/1 red Troll creature token onto the battlefield.
, , Sacrifice Graven Barrens: Put a -1/-1 counter on target creature.
: Add 
or 
to your mana pool.).: Put a 1/1 red Troll creature token onto the battlefield., , Sacrifice Graven Barrens: Put a -1/-1 counter on target creature.
