WATER is a very versatile Attribute, and even has a semi-viable Deck based around such monsters, the Water Deck. The Monster Types typically associated with WATER are Aqua, Fish, and Sea Serpent, though Plants and Reptiles are not uncommon Water types. WATER is usually thought of as the opposite to FIRE, though there is no real advantage for either Attribute over each other in the OCG/TCG.

Because of their versatility, Water monsters can be used in a number of strategic ways, possessing many different abilities. Some of the most powerful Water monsters include: "Gogiga Gagagigo", "White Night Dragon", "Fairy King Truesdale", and "Ocean Dragon Lord - Neo-Daedalus". The general strategy for all WATER decks is to create a lockdown on the field for the opponent while building up and replenishing the player's resources. This makes most WATER decks very passive, but that can be a good thing because water decks need some set up time to work their combos correctly. But the most popular Water Deck typically tries to boost the ATK of WATER Monsters with "A Legendary Ocean" while simultaneously lowering their Levels with "A Legendary Ocean" to summon them faster, a very effective strategy when played right. One example is "Giga Gagagigo", a level 5 normal Reptile with 2450 ATK, which is strong enough to overpower Monarchs. In Stardust Overdrive, WATER monsters gained new support, such as draw support from "Moray of Greed".

Archetypes include "Cloudian" (with the exception of "Cloudian - Eye of the Typhoon"), "Frog", and "Ice Barrier".

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