Crag Tubes enters the battlefield tapped unless you pay .
: Add or to your mana pool.
Put Crag Tubes on top of your library: Add to your mana pool.
: Crag Tubes becomes a 2/2 black Specter Cleric creature until end of turn. It's still a land.
.
: Add 
or 
to your mana pool. to your mana pool. 
: Crag Tubes becomes a 2/2 black Specter Cleric creature until end of turn. It's still a land.
