Swamp Battleguard [SP15-EN002] Shatterfoil Rare Water You can only activate this

You can only activate this effect of "Unending Nightmare" once per Chain

Set: Legendary Collection 2 Card type: Fusion/Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 "Uria

Set: The Dark Side of Dimensions Movie Pack: Gold Edition Card type: Effect Monster Rarity: Gold Secret Rare Attack: 4000 Defense: 4000 Requires 3 Tributes to Normal Summon (cannot be Normal Set)

Set: Shining Victories Card type: Fusion/Effect Monster Rarity: Rare Attack: 2400 Defense: 2000 2 "Lunalight" monsters Cannot be destroyed by battle

when a Spell/Trap Card

Swamp Battleguard [SP15-EN002] Shatterfoil Rare Water You can only activate thisSet: Star Pack ARC V Card type: Effect Monster Rarity: Shatterfoil Rare Attack: 1800 Defense: 1500 This card gains 500 ATK for each "Lava Battleguard" you control.