Ok, but let me ask you this: how low key can you be when your commander has 4 different effects? Trust me when I say this, if I don't know what a card does I read it, once I read that LIST of effects that your commander has I'm going to start deducing how your deck implements that commander and how it may run based off the commander's colors and the cards you play on your respective turns. So lets look at this:
Breya (W/U/B/R)
Ability 1: when she enters the field you get an artifact creature
Ability 2: Sac two artifacts to deal 3 points of damage
Ability 3: Sac two artifacts to -4/-4 another creature
Ability 4: Sac two artifacts to gain 5 life
Now looking at these abilities I have a series of questions for you. I want you to keep this in mind, I'm not attacking or putting down your ideas or opinions, I just want to show you some things that I see. I want to offer you my perspective on this;
Q1- What is the main THEME and GOAL of this deck?
Q2- Why did you choose THIS commander to lead your deck?
Q3- What combos are you trying to work towards and your main strategy that you'll be implementing?
Q4- I like
Marionette Master as well, you may want to play enchants that increase his Power drastically (like
grave strength)?
Q5- How low key did you plan on being playing a 4 color commander with 4 effects?
Q6- What is the most important aspect of this deck to you?