When Outpost Necropolis enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Outpost Necropolis on top of your library: Add to your mana pool.
, Sacrifice Outpost Necropolis: Add to your mana pool.
.
: Add or 
to your mana pool.
to your mana pool. , Sacrifice Outpost Necropolis: Add 
to your mana pool.
