Wave-Motion Cannon [CP05-EN004] Super Rare BT2-108 You can only use this

You can only use this effect of "Danger

Set: The Lost Millennium Card type: Fusion/Effect Monster Rarity: Ultra Rare Attack: 2100 Defense: 1200 Elemental Hero Avian' + 'Elemental Hero Burstinatrix' This monster cannot be Special Summoned except by Fusion Summon

Set: Saiyan Showdown Rarity: Special Rare Color: Yellow Card type: Extra

When an opponent's monster declares a direct attack

Wave-Motion Cannon [CP05-EN004] Super Rare BT2-108 You can only use thisSet: Champion Pack 5 Card type: Continuous Spell Rarity: Super Rare During your Main Phase, you can send this card to the Graveyard to inflict 1000 damage to your opponent for each of your Standby Phases that have passed since this card was activated.