Nightmare [International Collectors' Edition] Nahiri {T}: Gain control of target

{T}: Gain control of target creature with power less than or equal to Old Man of the Sea's power for as long as Old Man of the Sea remains tapped and that creature's power remains less than or equal to Old Man of the Sea's power

Set: Portal Second Age Type: Creature — Wurm Rarity: Rare Cost: {6}{G}{G} You may have Deathcoil Wurm assign its combat damage as though it weren't blocked

Set: Amonkhet Prerelease Promos Type: Creature — Cat Snake Rarity: Rare Cost: {1}{G}{G} This spell can't be countered

Set: Happy Holidays Type: Instant Rarity: Rare Cost: {3}{U} Search target opponent's library for four cards with different names and reveal them

Nightmare [International Collectors' Edition] Nahiri {T}: Gain control of targetSet: International Collectors' Edition Type: Creature Nightmare Horse Rarity: Rare Cost: {5}{B} 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 Nightmare arises from its lair in the swamps. As the poisoned land spreads, so does the Nightmare's rage and terrifying strength.