Beyond the Brave

This card's name becomes "Umi" while in the Spell & Trap Zone. You can only use each of the following effects of "Advent of Atlantis" once per turn. During your Main Phase: You can place 1 "Atlantis, City of the Sea Dragon" or "Umi" from your Deck, face-up in your Field Zone. If this card is sent to the GY: You can add 1 Level 7 Sea Serpent monster from your Deck to your hand.

Advent of Atlantis

While a monster that mentions "Atlantis, City of the Sea Dragon" is on the field, the Levels of all monsters in both players' hands and on the field are reduced by 1. When you Link Summon a "Daedalus" Link Monster, you can reduce the total number of materials by 1 (from Link Rating and from mentioned materials). If this card is in your GY and you control "Umi": You can place this card face-up on your field. You can only use this effect of "Atlantis, City of the Sea Dragon" once per turn.

Atlantis, City of the Sea Dragon

Add 1 monster that mentions "Atlantis, City of the Sea Dragon" from your Deck to your hand, then if you control "Atlantis, City of the Sea Dragon", you can negate the effects of 1 Effect Monster your opponent controls, until the end of this turn. If you control "Umi": You can banish this card from your GY; WATER monsters you control gain 500 ATK/DEF. You can only use each effect of "Call of Atlantis" once per turn.

Call of Atlantis

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Monster Arms of Atlantis" once per turn. If this card is Normal or Special Summoned: You can target 1 monster that mentions "Atlantis, City of the Sea Dragon" in your GY; Special Summon it in Defense Position. When your opponent activates a monster effect (Quick Effect): You can banish this card from your field or GY, and send 1 face-up "Umi" you control to the GY; negate that activated effect.

Monster Arms of Atlantis

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Siren Vortex of Atlantis" once per turn. If this card is Normal or Special Summoned: You can send 1 card that mentions "Atlantis, City of the Sea Dragon" from your Deck to the GY, except "Siren Vortex of Atlantis". If this card is sent to the GY and you control "Umi": You can Special Summon 1 WATER monster from your hand.

Siren Vortex of Atlantis

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Warchief of Atlantis" once per turn. You can discard this card; add 1 Spell/Trap that mentions "Atlantis, City of the Sea Dragon" from your Deck to your hand. If you control "Umi" and this card is in your GY: You can Special Summon this card.