Lake of the Dead

If Lake of the Dead would enter, 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}.

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Vintage Masters

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} to your mana pool.
{T}, Sacrifice a Swamp: Add {B}{B}{B}{B} to your mana pool.

Masters Edition

If Lake of the Dead would come into play, sacrifice a Swamp instead. If you do, put Lake of the Dead into play. If you don't, put it into its owner's graveyard.
{T}: Add {B} to your mana pool.
{T}, Sacrifice a Swamp: Add {B}{B}{B}{B} to your mana pool.

Alliances

When Lake of the Dead comes into play, sacrifice a swamp or bury Lake of the Dead.
oc
T: Add o
B to your mana pool.
oc
T: Sacrifice a swamp to add o
Bo
Bo
Bo
B to your mana pool.

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.