(Misty Catacomb isn't a spell.)
Misty Catacomb enters the battlefield tapped unless you pay .
Red spells cost more to play.
: Add or to your mana pool.
Put Misty Catacomb on top of your library: Add to your mana pool.
.
more to play.
: Add or 
to your mana pool.
to your mana pool. 
