(Dragonskull Outpost isn't a spell.)
Dragonskull Outpost enters the battlefield tapped unless you pay .
Untapped creatures you control get +0/+1.
: Add or to your mana pool.
Put Dragonskull Outpost on top of your library: Add to your mana pool.
.
: Add 
or 
to your mana pool. to your mana pool. 
