When Sulfurous Keep enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Sulfurous Keep on top of your library: Add to your mana pool.
, , Sacrifice Sulfurous Keep: Destroy target artifact.
.
: Add or 
to your mana pool.
to your mana pool. 
, , Sacrifice Sulfurous Keep: Destroy target artifact.
