It looks like a tropic dream. No, it isn't a dream, it's the monthly dragon for the battle arena named the Skywind Dragon. Win 100 Battlemarks and it's yours. Here's a description:

Skywind Dragon
Click image for larger version.  Name: Skywind_Epic.png  Views: 32  Size: 31.3 KB  ID: 52632
Rarity: Super Rare
Type: Tropic, Purple, Red
Habitat: Tropic Strand, Purple Gardens, Red Rocks
Available at: Level 15
Buying Price: 1,500 Gold
Selling Price: 100 Coin
Incubation: 15 hours
Exp Gained: 780 Exp

"Coming to the Island on great puffs of cloud, Skywind Dragons bring with them stories from beyond the shores! They travel beyond the horizon to worlds yet unseen by dragons and capture these memories in their stormy crystal balls. They then give these balls to young dragons to inspire them to seek out new lands yet undiscovered."