Card Rules: Rulings powered by The Netrep API. 'Mermaid Knight' can attack twice if 'Maiden of the Aqua' is making the field treated as 'Umi'. If you declare your second attack with 'Mermaid Knight' , and 'Umi' is destroyed during the Battle Step a replay occurs and you cannot attack a second time with 'Mermaid Knight'. If there is no 'Umi' on the field and 'Mermaid Knight' attacks then you Special Summon 'Maiden of the Aqua' to treat the field as 'Umi' you can attack a second time. Passcode: 24435369 Set: Structure Deck ATK/DEF: 1500/700 Card Number: SD4-EN011 Monster Type: Aqua Rarity: Common Attribute: Water Card Text: While 'Umi' is on the field this card can attack twice during the same Battle Phase. Level: 4 Card Type: Effect Monster Name: Mermaid Knight Edition: 1st