Dawn to dusk, your suggestion, except with more SoRs, is the very first thing that came to mind when I was thinking about what to do with devonian dragon. However, I've seen it done a few times before, in the arena, and even in league play or pvp1/2 occasionally, though not this season I don't think. I ended up submitting a slightly crazy time/death duo, using eternities and retroviruses (yes, really) for CC, and then some stall cards (SoSa, bone wall) and some graveyards, and then the eternity also doubles as a way to turn the graveyard skeletons into cool things. I actually thought about doing something with earthquake or black hole or something like that off the mark, too, but I've done that kind of thing a few times before, and I already know roughly how well such a deck would perform, so I didn't see any point me doing something like that again
I did a thread search and I did have devonian dragon once before, and I made a duo with water using nymph's tears and queens and purify, so that I could make lots of nymphs. It did very well, but for some bizarre reason it was rated very poorly by the community, even though I thought it was very creative, and hadn't seen anything like it before.