my playgroup would probably burn me alive if I try to play anything somewhat stax-like .
Cool, so not a competitive group. Then let's go with as powerful as we can. I'll also need to know what your budget restrictions are.
What you have so far is actually pretty good. You have mana ramp and card advantage, which is a common thing that people
forget. So I'll start with the touch-ups.
Land base is pretty good, with a few exceptions.
Bojuka Bog,
Dimir Aqueduct, and
Fetid Pools need to go. You can replace them with
City of Brass,
Mana Confluence, and
Reflecting Pool. I doubt you'll need the grave-hate that
Bojuka Bog provides (
The Scarab God is already a form of grave-hate), but if you do, use
Tormod's Crypt. If you aren't on any sort of budget, look into getting
Underground Sea and
Ancient Tomb.
For your card advantage, you're forgetting the wheel effects, namely
Jace's Archivist,
Windfall, and
Whispering Madness. Getting your opponents to discard their
hands creatures fuels your deck, and you get to draw some cards, while beefing up your graveyard. Speaking of which, don't shy away from mill effects. You won't win the game by milling someone out, but you will still get lots of good stuff for
The Scarab God. I would recommend
Consuming Aberration and
Mesmeric Orb.