This tactic is widely used against Protoss or Terran.As you understand from its name this tactic is based on building more and more Dragoons very rapidly in a limited time.But this tactic’s root is of course economics.So expansion time is more important than making Dragoons or war strategies.If the enemy has not extreme  war strategies this tactic will work, here collecting mineral is the key of success.Once you have collect enough minerals and gas you will be able to enlarge your Dragoon army easily and attack the strategical locations of your enemy succesfully.This tactic can be supported by Reaver drop and cliff Cannons but which means extra resources and extra focusing on other units so it may reduce your war performance , you must set yourself to the optimum focusing amount.Concentration is all important.