Beyond the Brave

4 monsters
This card's name becomes "Umi" while on the field. If this card is Link Summoned: You can Special Summon up to 3 monsters that mention "Atlantis, City of the Sea Dragon" from your GY to your zone this card points to, also you cannot Special Summon for the rest of this turn. Once per turn (Quick Effect): You can send 1 face-up "Umi" you control to the GY; send all cards on the field to the GY, except "Umi".

Azure Ocean Dragon Lord - Neo-Daedalus Rage

When your opponent would Normal or Special Summon a monster(s), while you control "Atlantis, City of the Sea Dragon": Negate the Summon, and if you do, destroy that monster(s), then if you control a WATER Link Monster, you can destroy all monsters on the field, except WATER monsters. You can banish this card from your GY and send 1 face-up "Umi" you control to the GY, then target 1 monster your opponent controls; send it to the GY. You can only use 1 "Daedalus Maelstrom" effect per turn, and only once that turn.

Daedalus Maelstrom

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Levia-Dragon of Atlantis - Daedalus" once per turn. If you control "Atlantis, City of the Sea Dragon" or "Umi": You can Special Summon this card from your hand. You can send up to 3 face-up "Umi" you control to the GY; add that many cards that mention "Atlantis, City of the Sea Dragon" from your Deck to your hand, except Level 7 monsters, then you can send 1 card on the field to the GY.

Levia-Dragon of Atlantis - Daedalus

3 WATER monsters
This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Levia-Dragoon - Daedalus" once per turn. If this card is Link Summoned: You can Special Summon 1 monster that mentions "Atlantis, City of the Sea Dragon" from your Deck. During the Main Phase (Quick Effect): You can send 1 face-up "Umi" you control to the GY; discard your opponent's entire hand, and if you do, they draw the same number of cards. Neither player can activate cards or effects in response to this effect's activation.