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.
It reduces the Level of monsters in hand which makes Level 5 monsters to be normal summoned without a tribute.
It gives 200 attack and defense to monsters.
Card effects that has a synergy with Umi also benefits from this card since this card name is treated as Umi.
Cons
Only WATER monsters can benefit from its effects.
Unlike Umi, it doesn't decrease the attack and defense of Machine and Pyro-Type monsters.
Your opponent is also affected by its effects which could be bad in a mirror match.
Lowering Hammer Shark's level means that you can only activate its ability twice.
Tips
Leevl 5/7 Water monsters
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.
Search
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.
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