Nightmare

Creature - Nightmare    (CMC:6)

Flying Nightmare's power and toughness are each equal to the number of swamps you control.

As the poisoned land spreads, so does the nightmare's rage and terrifying strength.

146 6E • ENMelissa A. Benson

™ & © 1993—1999 Wizards of the Coast

Legal in: Standard,Modern,Legacy,Vintage,Commander

Oracle Text (click to copy):

Nightmare {5}{B} Creature — Nightmare Horse Flying (This creature can't be blocked except by creatures with flying or reach.) Nightmare's power and toughness are each equal to the number of Swamps you control. ★/★

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4/1/2008
If 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.
10/1/2009
Nightmare's power and toughness changes as the number of Swamps you control changes.
7/1/2013
The ability that defines Nightmare’s power and toughness works everywhere, not just on the battlefield.
7/1/2013
Nightmare’s ability counts all lands you control with the subtype Swamp, not just ones named Swamp.

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