
| Type | Spell Card | 
| Property | Field | 
| Card Effect Type | Condition / Continuous-like Effect | 
| Passcode | 00295517 | 
| Archetypes | Umi | 
| Supports | WATER / Umi | 
| Related to Archetypes | Field Searcher | 
This card's name is treated as "Umi". Reduce the Level of all WATER monsters in both players' hands and on the field by 1. All WATER monsters gain 200 ATK and DEF.
| Pack | -- | 
| Level-up reward | -- | 
| Victory against | -- | 
| Card trader | Tradable [SR] [Required trader items] 
 | 
| Other | -- | 
| Rating | 7.5/10 | 
While A Legendary Ocean is face-up on the field, higher level Water monsters will be easier to summon. Level 5 monsters like Orca Mega-Fortress of Darkness can be normal summoned without tribute. They already have an attack advantage compared to most level 4 or lower monsters, and their attack is also increased from Legendary Ocean's effect. Levia-Dragon - Daedalus can be tribute summoned using only 1 tribute, making it much easier to use.
You can either bring more Legendary Oceans in the deck, or use card searches like Planet Pathfinder, or An Owl of Luck to search from your deck, ensuring that you get the field spell, which you can potentially get very early in the duel.

| Stat changes | All monsters gain ATK / All monsters gain DEF / All monsters lose Levels / Name condition | 
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