There is no way to answer this question with any degree of hard evidence. Based purely on my experiences and research, I'd rank them like this:
Most to least toxic
Anadrol/M1T/Methyl Tren
Dianabol/SD
DMZ?/Phera
Winstrol/Epistane/H-Drol
Anavar/Dienolone stuff/etc etc
I could be way off. SD might be far more toxic than Dbol and Anadrol, or it might only be something more like Phera or Epistane. Generally speaking, my thought is this: the more dramatic the gains, the more toxic it is. This is a common trade off with steroids. Gains vs. health risks. Since SD is among the strongest, I'd treat it with respect. Run UDCA. Run Milk Thistle if you like as well. Stay off the alcohol before AND after the cycle for a while. Eat right. Do cardio. Stay healthy as you can while you run it.
This is also why the general public, media and government typically assume that giant bodybuilders are at a severe health risk since they have in some cases double their mass over time. Granted, this isn't always the case. That's the point of cycling and running ancillaries throughout - to protect and recover the body's healthy state.
So that list is something I have created as a rule of thumb on how to treat each compound. Sure, there are far more compounds that I am not familiar with that could fit in various places in there but you get the picture. I'd treat DMZ like Phera or SD if I were you.