Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
I like these types of teams, I prefer sr necro dusk mane over sd mainly because I think Pblades is essential to have on mgar teams because you're with limited on responses to pogre (which you could probably replace the rocks for) but toxic/rest isn't bad. I also think wisp mgar looks interesting...