Widespread Ruin [MIL1-EN046] Rare Millennium Pack You can only use this

You can only use this effect of "Knightmare Mermaid" once per turn

Set: Premium Gold: Infinite Gold Card type: Xyz/Effect Monster Rarity: Gold Secret Rare Attack: 0 Defense: 0 2 Level 10 monsters All monsters you control gain ATK and DEF equal to the difference between your LP and your opponent's

Set: The Dark Side of Dimensions Movie Pack Card type: Effect Monster Rarity: Ultra Rare Attack: 0 Defense: 0 When a face-up "Blue-Eyes" monster(s) you control is destroyed by battle or an opponent's card effect

also you can only activate one more card or effect

at the end of the Damage Step: You can Tribute 1 other "Dinomist" monster

Widespread Ruin [MIL1-EN046] Rare Millennium Pack You can only use thisSet: Millennium Pack Card type: Normal Trap Rarity: Rare When an opponent's monster declares an attack: Destroy the Attack Position monster your opponent controls with the highest ATK (your choice, if tied).