Barrel Behind the Door [DR1-EN043] Rare Sea Serpent You can only use this

You can only use this effect of "Valerifawn

after that

Set: Legendary Dragon Decks Card type: Effect Monster Rarity: Common Attack: 0 Defense: 0 When a card or effect is activated that would inflict damage to you (Quick Effect): You can discard this card

Set: Extreme Force Card type: Link/Effect Monster Rarity: Common Attack: 1500 2 Cyberse monsters (Quick Effect): You can target 1 Cyberse Link Monster in your GY that was destroyed this turn

You can only use this effect of "Martial Metal Marcher" once per turn

Barrel Behind the Door [DR1-EN043] Rare Sea Serpent You can only use thisSet: Dark Revelation Volume 1 Card type: Counter Trap Rarity: Rare Yoy can only activate this card when an effect that inflicts damage to Life Points is activated (except Battle Damage). Switch the Effect Damage you receive to your opponent's Life Points.