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All, with their prices ↓Official rulings
4 rulings · in English, source ScryfallIf you control 0 swamps, then the Nightmare has 0 toughness and will be put into its owner’s graveyard as a state-based action right before the next player gains priority.
2008-04-01 · Wizards of the CoastNightmare’s power and toughness changes as the number of Swamps you control changes.
2009-10-01 · Wizards of the CoastNightmare’s ability counts all lands you control with the subtype Swamp, not just ones named Swamp.
2013-07-01 · Wizards of the CoastThe ability that defines Nightmare’s power and toughness works everywhere, not just on the battlefield.
2013-07-01 · Wizards of the CoastAll printings