Nightmare 

Creature - Nightmare Horse
The Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.
Power/Toughness:
0/0Artist:
Melissa A. BensonShare:
Text:
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.
Rulings:
No rulings foundLegality:
- standard: Not legal
- future: Not legal
- historic: Legal
- gladiator: Legal
- pioneer: Legal
- explorer: Legal
- modern: Legal
- legacy: Legal
- pauper: Not legal
- vintage: Legal
- penny: Legal
- commander: Legal
- brawl: Not legal
- historicbrawl: Legal
- alchemy: Legal
- paupercommander: Not legal
- duel: Legal
- oldschool: Not legal
- premodern: Legal
- predh: Legal
- oathbreaker: Legal
Sets:
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Welcome Deck 2017 #17 (rare)
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Welcome Deck 2016 #8 (rare)
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Magic Origins #282 (rare)
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Magic 2015 #276 (rare)
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Magic 2014 #108 (rare)
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Magic 2010 #107 (rare)
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Tenth Edition #164 (rare)
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Ninth Edition #150 (rare)
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Eighth Edition #150 (rare)
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Seventh Edition #150 (rare)
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Classic Sixth Edition #146 (rare)
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Fifth Edition #184 (rare)
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Fourth Edition #150 (rare)
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Summer Magic / Edgar #120 (rare)
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Revised Edition #120 (rare)
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Intl. Collectors’ Edition #27 (rare)
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Collectors’ Edition #27 (rare)
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Unlimited Edition #119 (rare)
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Limited Edition Beta #119 (rare)
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Limited Edition Alpha #118 (rare)
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Foreign Black Border #120 (rare)
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Fourth Edition Foreign Black Border #150 (rare)
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Theros Beyond Death Tokens #12 (common)
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Arena Beginner Set #54 (rare)
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The List #474 (rare)
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30th Anniversary Edition #412 (rare)
Other languages:
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Nightmare