Dragons seen in combat

[empress dee]

Judo dragon - Terra, Flame, and War (pvp)
Platinum - Metal and Ice (pvp)
Steampunk - Flame and metal (pvp)
Volcano - Flame and Terra (emerald cup 2)
Ice Cube - Sea and Ice (emerald cup 2)
Blizzard - Sea and Flame (emerald cup 2)  

[empress dee]

Steam Dragon - Sea, flame, and Ice (PvP)
Elements Dragon - Terra, Flame, and sea (pvp)
Quartz dragon - Terra, Ice, and Nature (pvp)
Petroleum - sea and dark (pvp)
Armadillo - Terra and metal (pvp)
Pure Flame - Trinity and Flame (pvp)
Pure Terra - Trinity and Terra (pvp)
Dark - dark (dark tournament 2)
Zombie - Metal and Dark (dark tournament 2)
Hedgehog - Terra and dark (dark tournament 2)  

[empress dee]

Peace dragon - Nature and Light (Nature 7)
Pure Nature - Trinity and Nature (Nature 7)
Pure Terra - Trinity and Terra (PvP)
Pure Electric - Trinity and Electric (PvP)
Pure Metal - Trinity and Metal (PvP)  

[empress dee]

Nature - Nature (Nature 2)
Tropical - Terra + Nature (Nature 2)
Gummy - Nature + electric (nature 2)  

[empress dee]

Cosmo - Terra and electric (Electric 7)
Pure electric - Trinity and electric (Electric 7)
Tesla - war and electric (electric 7)  

[empress dee]

Star - Terra and electric (event special)
War - war (war 3)
Colossal - war and terra (war 3)

War dragons hate the sea, but they can also do serious damage against it. Do not use a Terra and sea dragon because war dragons will plow the the Terra like old dirt.

Try using a Cloud dragon and use its sea moves.