Nightmare [Collectors' Edition] Condition:NM-Mint and the defense base is

and the defense base is a place where they can coordinate their efforts

add an amount of {C} equal to that spell's mana value

Set: Ninth Edition Type: Instant Rarity: Common Cost: {2}{R} Add {R}{R}{R}{R}{R}

Set: Khans of Tarkir Prerelease Promos Type: Legendary Creature — Orc Warrior Rarity: Mythic Cost: {2}{R}{W}{B} Haste

Nightmare [Collectors' Edition] Condition:NM-Mint and the defense base isSet: 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.