(: Add or to your mana pool.)
Unstable Den enters the battlefield tapped unless you control an enchantment.
: Unstable Den becomes a 2/1 red and white Ogre Troll creature until end of turn. It's still a land.
: Add 
or 
to your mana pool.): Unstable Den becomes a 2/1 red and white Ogre Troll creature until end of turn. It's still a land.
