Look for a village with very weak Air Defenses and Wizard Towers. The village should have lots of loot to steal!!!
Deploy your dragons around the outside in a village.
Lightning spell the closest air defense if it is truly hurtful to your army.
Rage the dragons near the resource storage you want to loot from.
Heal the dragons that are in a crowd together and have very little health.
Deploy the Barbarian King near the outside buildings if you have him. These buildings should be fairly far from the dragons.
Watch the dragons burn the village to crisps and please enjoy the raid!!!
(No execution notes)
This strategy personally helped me get my king all the way to level 5 within less than 2 months. I hope this strategy truly helps you earn Dark Elixir like a pro! Also, this strategy guarantees at least one star... most of the time this army can three-star a village! :)
If you want to see proof, please view the video below. It features me attacking a very tough TH7 (I three-starred him!).
EXAMPLE OF ULTIMATE DRAGON RAID!!! (note: keep the volume low as it can get annoying)