"A Legendary Ocean" is considered to be "Umi" (so you can't have 3 of that and 3 Umi because then you'd be playing with 6 Umi cards). However the card is still considered to be "A Legendary Ocean" on top of that. But that differential is what allows "Warrior of Atlantis" to search out only "A Legendary Ocean". If its effect allowed it to search out "Umi" then it would be able to find both.
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