When an opponent's monster declares an attack: Target the attacking monster; negate the attack, and if you do, inflict 800 damage to your opponent for each Fish, Sea Serpent, or Aqua-Type monster you control.
Set Information including prices and price hyperlinkes are taken from TCGplayer.
Cardmarket Yu-Gi-Oh! Sets
Set Information including prices and price hyperlinkes are taken from Cardmarket.
We use the Cardmarket "Trend Price", as such this doesn't differentiate between card editions. It simply gives a sale trending price across all card versions.