Apocalypse Demon [Hour of Devastation Prerelease Promos] Wolf Horror if you activate a Spell/Trap

if you activate a Spell/Trap Card or effect while this card is in your GY (except during the Damage Step): You can Special Summon this card

You can only use each effect of "Vampire Retainer" once per turn

the Magistus Moon Maiden" once per turn

Set: 2016 Mega-Tins Mega Pack Card type: Xyz/Effect Monster Rarity: Super Rare Attack: 2510 Defense: 2000 3 Level 4 LIGHT monsters You can also Xyz Summon this card by using a "Number 39: Utopia" you control as the Xyz Material

Apocalypse Demon [Hour of Devastation Prerelease Promos] Wolf Horror if you activate a Spell/TrapSet: Hour of Devastation Prerelease Promos Type: Creature Demon Rarity: Rare Cost: {4}{B}{B} Flying Apocalypse Demon's power and toughness are each equal to the number of cards in your graveyard. At the beginning of your upkeep, tap Apocalypse Demon unless you sacrifice another creature.