Water

Water is one of the 11 known attribute. Due to the sheer number of creatures that fall under the criteria to be Water attribute, it is one of the most versatile elements. Creatures featured on Water cards tend to be aquatic or amphibious. Due to the sheer number of creatures this entitles, they're HP and attacks don't really follow any guidelines and can range very wildly. Despite this, water attributes tend to have moderate attacks and fairly powerful abilities, although they tend not to be as powerfuls as those attributes that rely more heavily on attacks and/or abilities.

Deck Strategies
Water-type cards are excellent for surprises. As their HP and attack power typically don't follow any trends, they are great for unpredictability. There are as many different strategies as there are fish in the sea.

However, as note, Lightning attributes are quite a threat to those that specialize in Water attributes.

Notable Cards
Aqua Devastator is quite a powerful and devastating move that ensures the defeat of all creatures on the field. It is often used by Water creatures as a last ditch effort when defeat is imminent.

Half-Water Attributed Cards
Primarily Water Attributed

Moves
Secondarily Water Attributed