Help with a hidden commander deck

Hello r/EDH! I'm looking to make a deck with [[Riku of Two Reflections]] with [[Mizzix of the Izmagnus]] being a sort of alternate/secondary build-around card. Are there any specific cards or combinations of cards that are really useful for finding and keeping Mizzix, or any good ways to recur her if she gets offed? I'm already running the best creature tutors, and swiftfoot boots/lightning greaves, but I feel like I might be missing something. Any ideas for people with experience with hidden commanders is appreciated!