Atlantean

"Atlantean" ( Kaiō) is an archetype of Sea Serpent-Type WATER Monster Cards. They were first introduced in Phantom Darkness, with "Atlantean Pikeman". They later gained more members in Return of the Duelist and Structure Deck: Roar of the Sea Emperor, which also introduced their first support card, "Atlantean Marksman".

Playing Style
The focus of this Archetype is to swarm the field with Level 3 or lower WATER monsters with the effects of "Atlantean Marksman", "Deep Sea Diva" and "Atlantean Armed Soldier" to later tribute them for the summon of their ace monster, "Atlantean Dragon Poseidra", or to Synchro Summon with "Deep Sea Diva" and "Genex Controller", preferly the Ice Barrier synchro monsters.

Also, "Atlantean Marksman" and "Atlantean Armed Soldier" monster trigger their effects when they are sent to the graveyard as cost for a WATER monster's effect, so cards like "Abyss Soldier" would be a good add to the deck.

Monsters

 * "Atlantean Dragon Poseidra"
 * "Atlantean Assault Trooper"
 * "Atlantean Armed Soldier"
 * "Atlantean Marksman"
 * "Deep Sea Diva"
 * "Lost Blue Breaker"
 * "Spined Gillman"
 * "Mermaid Archer"
 * "Abyss Soldier"
 * "Dragon Ice"
 * "Genex Undine"
 * "Genex Controller"
 * "Treeborn Frog" (As a tribute for Poseidra)

Spells

 * "Salvage"
 * "Surface"
 * "Moray of Greed"
 * "Swords of Revealing Light"

Traps

 * "Call of the Haunted"
 * "Safe Zone"
 * "Fiendish Chain"
 * "Aegis of the Ocean Dragon Lord"