To dream that you have a master, is a sign of incompetency on your part to command others, and you will do better work under the leadership of some strong-willed person.
If you are a master, and command many people under you, you will excel in judgment in the fine points of life, and will hold high positions and possess much wealth. ... Ten Thousand Dream Interpretation
Dreams of a master represent that you’ve been cultivating your natural genius and are coming into your power and influence. This dream can also help you to vent out power struggles you have within yourself, in your relationships or with someone at work. Consider the possibility that you are dealing with issues of having “power over” someone, or perhaps someone is lording their power over you.... Strangest Dream Explanations
Dreams of Toastmasters represents that you are preparing for a public presentation of your thoughts, feelings, expertise, and unique gifts you have to share with the world.
If this dream feels stressful, then you are venting out and moving through your fears of public speaking, and you are building up your confidence to express yourself more effectively. See Speech.... Strangest Dream Explanations