Caldera Tubes enters the battlefield tapped.
: Add or to your mana pool.
Sacrifice Caldera Tubes: Add or to your mana pool.
: Caldera Tubes becomes a 2/2 red Orc creature until end of turn. It's still a land.
: Add 
or 
to your mana pool. or to your mana pool.
: Caldera Tubes becomes a 2/2 red Orc creature until end of turn. It's still a land.
