(: Add or to your mana pool.)
When Obsidian Caldera enters the battlefield, return a land you control to its owner's hand.
, Sacrifice Obsidian Caldera: Obsidian Caldera deals 1 damage to target creature or player.
: Add 
or 
to your mana pool.), Sacrifice Obsidian Caldera: Obsidian Caldera deals 1 damage to target creature or player.
