Someone posted a similar deck on Reddit and said they got to KoG with it. They had a 3rd Kuriboh over Dark Mimic and a 2nd Mirror Wall over Windstorm, but it shouldn't make too much of a difference
I've been playing since January, and the only packs at that time were Ultimate Rising, Age of Discovery, and Neo Impact. Went deep into Ulitmate Rising twice, and went pretty deep into Age of Discovery a few months back to build a Hammer Shark deck, and got the Stray Lambs along the way. Never felt it was necessary enough invest into Neo Impact for another Mirror Wall or Senju