This is a Black/Green Collected Company build.
The combo we are trying to get on the board is Devoted Druid + Obelisk Spider + Quillspike
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Hapatra, Vizier of Poisons is in the mainboard at 4 because of the value we get for all of the -1/-1 counters each of our other creatures provide. If we fail to find Obelisk Spider for any reason, Hapatra, Vizier of Poisons provides and backup combo that produces infinite 1/1 green snake tokens with deathtouch.
Black/Green gives us access to most of my favorite removal in the game. Abrupt Decay handles many problems beyond creatures in modern. Fatal Push works well for any pesky creatures. Maelstrom Pulse can handle tokens or take care of any nonland permanent that is stacking up against you. Finally, Black Sun's Zenith is our board clear that also synergizes with Hapatra, Vizier of Poison, Obelisk Spider, and Necroskitter.
Dark Confidant, Collected Company, and Chord of Calling all help us dig or tutor up our combo pieces.
I find that this deck can finish the game quickly, usually turn four or even three if your opponent puts an extra land on your board. The creature base also allows you to grind if need be because of the higher toughness of the creatures or your snake tokens.
I've only play tested this deck for a short time, but find myself enjoying it's interactions and available lines. The sideboard is tuned to the local meta of my play group, but still covers a lot of the match ups in modern.
Please leave comments and suggestions, they are greatly appreciated.
Cheers!