Graven Clachan enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Sacrifice Graven Clachan: Add or to your mana pool.
, : Add one mana of any color to your mana pool.
.
: Add or 
to your mana pool. or to your mana pool.
, : Add one mana of any color to your mana pool.
