The third is Arbor Elf and Underworld Connections. Cast on Forest, double up. The life loss shouldn't be a problem. Obviously this would be better with Duals, but still works fine in a pinch. You have lots of land fetchers to make this easier.
My main deck for the rest of the year will be something similar. I knew I wanted to give G/B a real go, because I had 3 Overgrown Tomb and 2 Abrupt Decay I've won in drafts and got at the prerelease. I tested various G/B midrange options on MWS.
It took a while to come up with something I liked. I started with many of the cards you are using, ramping into tasty 4 and 5 drops, but found the midrange strategy losing to other midrange decks, in particular Jund and was too susceptible to control.
I slowly started taking the deck in other directions, firstly control, using Mutilates and 1-2 Planeswalkers, which meant agro was completely solidified and midrange became a little easier, but still less than 50% wins there. The Control match didn't improve. The deck was also less fun.
I'd seen the problem both decks were having was that removal was killing me. I'd get in a strong position, drop a bomb and see it disappear. What I decided was I wanted a deck that could handle the removal and that the ramp was not as important as I had thought. I put in the forgotten Strangleroot Geist, Dreg Mangler and used Vorapede as a finisher. If my opponent uses their Pillar of Flame on my Elf then they may be staring down a T2 Geist with no answer. Nighthawk is an absolute removal magnet, which is fine, because if you drop a Vorapede they don't really have a way to deal with. Vorapede also flat out wins in a showdown with Thragtusk.
I also saw the new event deck had a large amount of the cards I wanted getting me a Thragtusk and a Woodland Cemetery in the process.
I appreciate that Arbor Elf does work significantly better with Overgrown Tombs and if I was to suggest you drop your money on any cards for this deck I would say those. I will be buying a 4th to allow me drop that T2 bomb.
Magic is pretty awesome to us budget players for printing the golgari deck. I've long advocated they give snapcaster mage the stoneforge mystic treatment in an event deck and am glad they at least did it for Thragtusk.
Why don't we workshop the creep and conquer deck here since its a similar format? Keep in mind Thragtusk is easily a $15 card right now and Woodland Cemetery can sell for $8 at minumum (these prices should continue for at least a week) so we potentially even have a little window to arbitrage and trade for some other goodies to add in.
The trio of Nighthawk, Strangleroot, and Dredge Mangler is awesome because even in lategame they are threats that need to be taken care of.
I unfortunately haven't been able to test yet so no clue on which direction to take creep & conquer. For those playing B/G midrange, which decks are giving you the most trouble? Just all the control decks? I would imagine anything running 3x terminus is deadly but can't think of anything else that specifically hoses us.