Rotting Seafloor enters the battlefield tapped unless you sacrifice an artifact.
: 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 an Island.
Shadow
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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 an Island.
