Hollow Caldera enters the battlefield tapped.
: Add to your mana pool. Activate this ability only if you control a Swamp.
: Add to your mana pool. Activate this ability only if you control a Mountain.
At the beginning of your upkeep, sacrifice a Cleric.
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: Add 
to your mana pool. Activate this ability only if you control a Swamp.
to your mana pool. Activate this ability only if you control a Mountain.
