Humble Defector will return to the control of the player still in the game who most recently controlled it
Soul Sisters is traditionally a mono-white deck, a concept Im not sure can be supported in Commander under that exact color identity, but I am certain can work with the addition of other colors
Since they are all Decayed, you should also be playing the when a Zombie dies effect like Diregraf Captain or Plague Belcher or Vengeful Dead
Disturb At the beginning of your upkeep, if this creature has two or fewer judgment counters on it, put a judgment counter on it
Im very excited to get started, but I do want to be up-front about the fact that Im unfamiliar with the Warhammer 40,000 universe
While Lodestone Golem is merely doing time for Mishras sins, Monastery Mentor would be broken in Vintage even if you were to remove any four other cards