Sunken Caldera enters the battlefield tapped.
: Add to your mana pool. Return Sunken Caldera to its owner's hand.
: Sunken Caldera becomes a 2/2 red Troll creature until end of turn. It's still a land.
: Add 
to your mana pool. Return Sunken Caldera to its owner's hand.
: Sunken Caldera becomes a 2/2 red Troll creature until end of turn. It's still a land.
