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If Lake of the Dead would enter the battlefield, sacrifice a Swamp instead. If you do, put Lake of the Dead onto the battlefield. If you don't, put it into its owner's graveyard.
{T}: Add {B}.
{T}, Sacrifice a Swamp: Add {B}{B}{B}{B}.
The tap and sacrifice counts as tapping the land for mana.
You have to sacrifice a swamp before this card is put onto the battlefield. And you have to do this no matter how it is put onto the battlefield.
