Card Trivia:Umi
- This card is based on the sea, a large body of water inhabited by fish, mythical sea serpents, and other aquatic creatures.
- This card's effect supporting Thunder likely references how water acts as a conductor for lightning and electricity
- This card's Pyro and Machine anti-support effect references how water can respectively extinguish fires and rust up/short out machines.
- This card is also based on the Ocean terrain in the original Yu-Gi-Oh! manga and anime.
- "A Legendary Ocean", "Forgotten Temple of the Deep", "Lemuria, the Forgotten City", "Magellanica, the Deep Sea City", "Maiden of the Aqua", and "Pacifis, the Phantasm City" feature effects that allows them to be treated as "Umi" while face-up on the field.
- "A Legendary Ocean", "Lemuria, the Forgotten City", "Pacifis, the Phantasm City", and "Magellanica, the Deep Sea City" are also Field Spell Cards featuring effects that allows them to always be treated as "Umi".
- This card has a Skill Card counterpart: "Mythic Depths".
- This card's official Chinese name has been mentioned in card text of a few other cards, but so far, no official Chinese prints of it have been released.
