(Salt Den isn't a spell.)
When Salt Den enters the battlefield, sacrifice it unless you pay .
, : Scry 2.
, Pay 1 life: Add or to your mana pool.
, , Sacrifice Salt Den: Draw a card.
.
, 
: Scry 2., Pay 1 life: Add or 
to your mana pool., , Sacrifice Salt Den: Draw a card.
