Dragons are generally the brute force behind the element, oftentimes characterized by having fairly high stats (double-digit ATK or HP values). These cards are powerful damage dealers in most cases, but they are all incredibly expensive (usually costing at least 10 quanta of a specific elemental type).
The upgraded versions of these cards often have slight improvements to the ATK stat, with varying changes to the HP (most dragons gain small or significant boosts to the HP stat, while others have no change or lose HP to counterbalance the boost in ATK). Most dragons are strong against basic damage-reducing shields (as their ATK can still chip away the opponent’s health indiscriminately), but some shields can still block them completely (Gravity Shield, Hope, Dimensional Shield, and others). The Wings card has no effect on Dragons, as they are all have the airborne passive skill.
In most cases, the Dragons are often used in mono-decks to provide hard-hitters within a deck, and are always included in the starting deck for a new player.
For Aether, the Phase Dragon is immaterial, making it the only dragon with an ability (immortality), thus making it immune towards negative (and also positive) targeting effects. Its cost-attack ratio however, is fairly expensive.