![Sylveon (XY04) [XY: Black Star Promos] WTR015-R when an opponent's monster declares](https://cdn.shopify.com/s/files/1/0561/5822/4482/files/8a8f7075-b421-46fb-bb74-915a4420f8c3.png?v=1721854491)
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when an opponent's monster declares an attack: You can change 1 face-down Defense Position "Subterror" monster you control to face-up Attack or Defense Position
Set: Arcane Rising Unlimited Edition: Unlimited Finish: Rainbow Foil Type: Action Rarity: Majestic Class: Mechanologist Cost: 1 Whenever you boost a card this turn
Set: Rise of the Unison Warrior Prerelease Promos Rarity: Rare Game character: Boujack Color: Blue Card type: Extra
Set: XY: Evolutions Type: Lightning Rarity: Holo Rare Retreat cost: Colorless
Sylveon (XY04) [XY: Black Star Promos] WTR015-R when an opponent's monster declaresSet: XY: Black Star Promos Type: Fairy Rarity: Promo Retreat cost: Colorless