Super soft, easy-to-work ground could be done a few ways; but it’s still slow and a lot of work. Hard, dry ground = little Ditch Witch. I’ll add that a DW may seem like over-kill and a small trencher (same principle) might be enough, and cheaper. Look around for any other task you could use it for…your 200’ won’t take long. Watch for underground utilities, etc. I’m in a spot right now where the very-suspect locator dude swears there is nothing there but the phone company post says otherwise…dang.