The "Element" cards are a series of LIGHT and DARK monsters that gain two additional effects (such as ATK boost, Effect negation, and double attack) when a certain Attribute is present on the field other than their own. They're all Level 4 monsters with 1500 ATK and 1200 DEF. Effects themselves are also generic:
FIRE provides a respectable 500 ATK boost (to 2000).
WATER prevents the monster from shifting to the opposing player.
WIND allows the monster to attack up to twice during the Battle Phase by first having destroyed another monster.
EARTH allows the monster to negate the effect of another monster it destroys.
No two "Element" monsters have the same combination of effects and they always depict the Attributes where they gain their effects in the background of the cards.
Because of their low ATK, they can often be searched by many searchers, such as "Mystic Tomato", "Shining Angel", and "Sangan". However, their effects are not game breaking, thus should be used to supplement another archetype, rather than try to win on their own. They also suffer from the fact that each only possess two out of the four possible effects, thus reducing each card's flexibility. The play style is not very competitive anymore, but a decent Deck can be made from these using cards like Scroll of Bewitchment. There is also the possibility of using "DNA Transplant" if you would like to rely on one particular ability. A player using a Deck built around these would also do well to use the Charmers and their possessed variations.