Mulligans
Combo Mulligans
Kabal Talonpriest and Mirage Caller should only be kept if you have a 1 or 2 cost minion in your hand. Twilight Acolyte, Duskbreaker, and Drakonid Operative should only be kept if you have another dragon such as Cobalt Scalebane or Bone Drake.
As promised, I released a more budget deck with only the necessary legendaries. Twilight Acolyte is not necessary so to be even more budget that can be swapped for a Gnomish Inventor.