Nightmare [Fourth Edition] Gold Series 2009 You can only use each

You can only use each effect of "Darklord Ixchel" once per turn

•Once per turn: You can banish 1 "Gem-" monster from your Graveyard to target 1 "Gem-Knight" card in your Graveyard

Set: Legendary Collection 2 Card type: Normal Monster Rarity: Common Attack: 800 Defense: 2000

Set: Unlimited Edition Type: Creature — Merfolk Rarity: Common Cost: {U} Most human scholars believe that Merfolk are the survivors of sunken Atlantis

encompasses all

Nightmare [Fourth Edition] Gold Series 2009 You can only use eachSet: Fourth 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.