Really more like a Fire deck with just a splash of Dark. Also I am basically brand new to this game, and this is my first deck I've built that wasn't the cliche poison rush for farming.
5f0 5f0 5f0 5f0 5f0 5f0 5f0 5f3 5f3 5f4 5f4 5f6 5f6 5f7 5f9 5f9 5f9 5f9 5fb 5fb 5fc 5fc 5fc 5l9 5l9 5l9 5l9 5um 5up 5up 606 606 606 606 6rn
My main strategy is just to use Immolation on Photons and weak Fire Spirits (or existing Phoenixes) to build up a lot of quanta and quickly play my Phoenixes. Then, use my other cards to control the opponent's creatures and permanents. The Devourer is in there because I can Immolate it, or leave it as a source of dark quanta for Steals.
With this deck I'd say I can take down level 3 AI's at least 9/10 times, the 1/10 of course being crappy draws, etc. But it's only had about a 60% win rate on Top 50's and I haven't even tried anything after that.