Nightmare [Revised Edition] XY111 If this card is Tributed

If this card is Tributed for a Tribute Summon: You can target 1 monster with 800 ATK and 1000 DEF in your Graveyard

when a LIGHT monster you control battles: You can send this card from your hand to the Graveyard to have that monster gain ATK equal to the ATK of the opponent's monster it is battling

If this Ritual Summoned card is sent to the GY: You can add 1 Ritual Spell from your Deck to your hand

"To examine the causes of life

This card gains 200 ATK for each Xyz Material attached to it

Nightmare [Revised Edition] XY111 If this card is TributedSet: Revised 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.