Caldera Den enters the battlefield tapped.
: Add to your mana pool. Return Caldera Den to its owner's hand.
, Sacrifice Caldera Den: Caldera Den deals 1 damage to target creature or player.
: Add 
to your mana pool. Return Caldera Den to its owner's hand., Sacrifice Caldera Den: Caldera Den deals 1 damage to target creature or player.
