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