Nightmare

Creature — Nightmare Horse */*, 5B (6)

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.

The thunder of its hooves beats dreams into despair.

Illus. Vance Kovacs

Gatherer Card Rulings?, Legality?

• 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.

• Legal in Vintage (Type 1)
• Legal in Legacy (Type 1.5)
• Legal in Extended (Type 1.X)
• Legal in Standard (Type 2)
• Legal in Classic (MTGO)
• Legal in Commander
• Legal in Modern