- This card can be searched by "A Cat of Ill Omen" and "The Despair Uranus".
- Even if "Umi" (or a card with the Name condition that always treats its name as "Umi") is removed from the field, "Maiden of the Aqua" can continue to treat the field as "Umi" and thus allow this card to survive. "Forgotten Temple of the Deep" can also keep this card on the field because its name is changed to "Umi" while face-up.
- Use with cards that allow direct attacks against you, such as "Astral Barrier", "Absolute End" and most notably, "The Legendary Fisherman".