Unrelated to the card of the same name.
The only deck I will advocate playing more than 40 cards in, Genex Sea Emperor Mermail requires the extra cards to stabilize the deck and create stronger draws. It's actually quite surprising. I run 45 cards in this version, but it is really your preference how many you run - just make sure to keep your composition relatively consistent.
Monsters [28]
2 Genex Controller
2 Genex Undine
3 Atlantean Dragoons
3 Atlantean Marksman
3 Atlantean Heavy Infantry
3 Mermail - Abysspike
3 Mermail - Abysslinde
2 Mermail - Abyssmegalo
1 Mermail - Abyssgunde
2 Deep Sea Diva
2 Tragoedia
1 Gorz the Emissary of Darkness
1 Moulinglacia the Elemental Lord
Spells [11]
3 Salvage
3 Mystical Space Typhoon
1 Pot of Avarice
1 Heavy Storm
1 Dark Hole
1 Monster Reborn
1 Mind Control
Traps [7]
3 Abyss-sphere
2 Compulsory Evacuation Device
2 Torrential Tribute
Extra Deck [15]
1 Ally of Justice Catastor
1 Armory Arm
1 Black Rose Dragon
1 Gaia Knight, the Force of Earth
2 Gungnir, Dragon of the Ice Barrier
1 Mist Wurm
1 Scrap Dragon
1 Stardust Dragon
1 Tech Genus Hyper Librarian
---
1 Gagaga Gunman
2 Number 17: Leviathan Dragon
1 Mermail - Gaioabyss
1 Snowdust Giant
Effects of Atlanteans trigger if detached as material from Xyz monsters, hence the mostly WATER lineup. Gaioabyss is just really good.
The only deck I will advocate playing more than 40 cards in, Genex Sea Emperor Mermail requires the extra cards to stabilize the deck and create stronger draws. It's actually quite surprising. I run 45 cards in this version, but it is really your preference how many you run - just make sure to keep your composition relatively consistent.
Monsters [28]
2 Genex Controller
2 Genex Undine
3 Atlantean Dragoons
3 Atlantean Marksman
3 Atlantean Heavy Infantry
3 Mermail - Abysspike
3 Mermail - Abysslinde
2 Mermail - Abyssmegalo
1 Mermail - Abyssgunde
2 Deep Sea Diva
2 Tragoedia
1 Gorz the Emissary of Darkness
1 Moulinglacia the Elemental Lord
Spells [11]
3 Salvage
3 Mystical Space Typhoon
1 Pot of Avarice
1 Heavy Storm
1 Dark Hole
1 Monster Reborn
1 Mind Control
Traps [7]
3 Abyss-sphere
2 Compulsory Evacuation Device
2 Torrential Tribute
Extra Deck [15]
1 Ally of Justice Catastor
1 Armory Arm
1 Black Rose Dragon
1 Gaia Knight, the Force of Earth
2 Gungnir, Dragon of the Ice Barrier
1 Mist Wurm
1 Scrap Dragon
1 Stardust Dragon
1 Tech Genus Hyper Librarian
---
1 Gagaga Gunman
2 Number 17: Leviathan Dragon
1 Mermail - Gaioabyss
1 Snowdust Giant
Effects of Atlanteans trigger if detached as material from Xyz monsters, hence the mostly WATER lineup. Gaioabyss is just really good.