Crag Glen enters the battlefield tapped.
: Add or to your mana pool.
Put Crag Glen on top of your library: Add to your mana pool.
: Crag Glen becomes a 1/1 blue and red Goblin creature with flying until end of turn. It's still a land.
: Add 
or 
to your mana pool.
to your mana pool. : Crag Glen becomes a 1/1 blue and red Goblin creature with flying until end of turn. It's still a land.
