(Misty Catacomb isn't a spell.)
Misty Catacomb enters the battlefield tapped.
, : Scry 2.
: Add or to your mana pool.
Put Misty Catacomb on top of your library: Add to your mana pool.
, 
: Scry 2.: Add 
or 
to your mana pool. to your mana pool. 
