If you control "The Legendary Fisherman", you can activate "Umi" directly from your Deck or GY. This Skill can only be used once per Duel. Once per turn, when "The Legendary Fisherman" you control destroys a monster by battle or inflicts battle damage to your opponent, you can Special Summon 1 Level 4 or lower WATER monster from your Deck or GY in Defense Position.