Edit: IGNORE the sideboard and Maybeboard. I use these to manage my real life cards; they basically represent cards I either still need to take out and replace in my physical deck or cards I was just thinking about.
Give -1/-1 counters to trigger various effects (Obelisk Spider, Nest of Scarabs, Hapatra). Usually this results in armies of insects and deathtouch snakes if you keep Hapatra on the board enough to trigger some -1/-1's. Win con is to swarm (seriously, the insects and snakes get out of control if the opponent doesn't do something about it fast), and otherwise just use your board state in general (yeah that sounds lame, but usually their board state will be severely weakened while you can attack with Ammit Eternals with their Afflict, or sneak them through with Key to the City, or fly over with Archfiend)
Synergies:
Key to the City & Hapatra (stop worrying about her being blocked and give that -1/-1 to someone, earning yourself a snake)
Key to the City & Archfiend (you discard to activate the Key, so it triggers Archfiend)
Key to the City & Ammit Eternal (get your Ammit through their defenses to shrug off accumulated -1/-1 counters)
Ammit Eternal & Consuming Fervor (you get delicious -1/-1 counters when opponents cast spells, why not also once per turn; and then if you can get Ammit past their defenses shrug off all of those -1/-1's you've been picking up?)
Channeller Initiate & Consuming Fervor (have the Initiate give mana forever, and earn juicy -1/-1 counters at the same time. Be sure to actually use them so he doesn't die though.)
Nest of Scarabs/Hapatra & Ammit Eternal (Ammit gets -1/-1 counters every time the opponent casts something, and if you can get Ammit to hit the opponent directly, Ammit resets back to a 5/5, starting this cycle over again)
Nest of Scarabs/Hapatra & ... well you get the idea. Make lots of -1/-1 counters everywhere: on the opponent when you can, but it's not the end of the world if you make them on yourself, too. You have at least one creature that likes them (Channeller Initiate) and one that can get rid of them natively (Ammit Eternal).
Note that Channeler Initiate triggers Nest of Scarabs 3x, so does Stinging Shot if not cycled for a card or to trigger Archfiend. And note that Archfiend triggers everything for each counter because they're all separate instances.
You can get card draw from The Scorpion God. Go forth! Give -1/-1 counters like candy!
