Water is a very versatile Attribute, and even has it's own 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.
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, Fairy King Truesdale, and Levia-Dragon - Daedalus. The popular Water Deck typically tries to boost the ATK of Water Monsters with Field and Equip Spell Cards as well as monster effects, while simultaneously lowering their Levels with A Legendary Ocean to summon them faster, very effective strategy when played right.
Water monsters enjoy great support, especially from Spell and Trap Cards such as Tornado Wall, Big Wave Small Wave, and Salvage. They also have 3 Field Spell Cards specifically targeted towards them, more than any other Attribute:
Monster cards that aid Water Decks are great in number as well:
- Mother Grizzly, a Deck Searcher for Water Monsters.
- Star Boy, boosting the ATK strength of all Water monsters on the field by 500.
- Eria the Water Charmer allows the player to take control of the opponent's Water Monsters.
- Warrior of Atlantis use to search "A legendary Ocean out.
One weakness of Water Decks and Water monsters in general, is that they rely on Umi or A Legendary Ocean to work to their potential. Some of their effects are also rather passive compared to other Attributes, such as Fire's aggression and Earth's reliable defensive tactics. All in all, though, a well-prepared Water deck can be an extremely difficult obstacle to overcome.