DragonVale: How to Breed the Silver Dragon
The Silver Dragon has a base breeding time of 47 hours, sells for 4,000,000 coins, and earns 500,000 XP for successful breeding once you reach level 17.
To breed the Silver Dragon, you must mix dragons Cold and Metal elements. Metal + Cold or Metal + Evergreen are popular combinations. If you get a 47 hour incubation time then you’ve got it.