Graven Fortress enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Graven Fortress on top of your library: Add to your mana pool.
, : Graven Fortress deals 1 damage to target attacking creature.
.
: Add 
or 
to your mana pool.
to your mana pool. , : Graven Fortress deals 1 damage to target attacking creature.
