Driven / Despair

After looking at some cards more in depth, I feel that Driven / Despair would fit so well in this deck as the CMC for both options is very low, and it can cause some devastating effects for our opponent. Firstly, everything we have will gain trample, which, if Ammit Eternal, or The Scorpion God is on the battlefield can already be a pretty bad day for our opponent in terms of damage. If we have a ton of snakes or insects out the trample ability isn't what matters so much as the ability to be able to draw a card for each creature that does damage this turn. That's a hell of a lot of card draw.

Despair is just as good, as it gives all of our creatures menace. The ability to cast both of these in the same turn will be absolutely devastating as everything has trample and menace, along with the ability to draw a card each time we do damage, and our opponent must discard a card each time we do damage because of Despair. This card alone can and will change the outcome of a game if played at the right circumstance.

Appeal / Authority

Appeal / Authority is another card that could be a potential addition. Appeal gives one of our creatures a massive +X/+X where X is the amount of creatures we control and also gives that creature trample. Authority allows us to tap two of our opponent's target creatures as well as give our snakes, insects, and other creepy crawly creatures vigilance, effectively leaving our board full of blockers next turn.

Claim / Fame

Claim / Fame is a great card to get our creatures that we need back from our graveyard. Hapatra only being a 2/2 is a heavy target for removal and as she is the engine of our deck, we will need her back. I have been previously running Wander in Death to bring and another creature back as well, however the 1 drop for Claim is fantastic. Fame is also awesome, because Hapatra can become a 4/2 with Haste the turn we bring her back if we choose to play it that turn. If not, we can use that on any creature throughout the game.

Banewhip Punisher

This is a easy and cheap way to remove any of our opponent's enemies. She comes in to the battlefield and instantly drops a -1/-1 counter on a creature, and we can sacrifice her for 1 mana to destroy any target creature.

Cryptolith Rite

Cryptolith Rite would be useful in the situations that we don't have a ton of mana, or we need to activate our abilities. It will give all of our creatures the ability to tap for any mana of any color. With the amount of tokens we generate, this a lot of mana being generated.

Majestic Myriarch

Majestic Myriarch is a card I'm not too excited for, but it could create a ton of issues for our opponent if it comes in at the right time. It has X/X where X is the amount of creatures we have, and it will also get all of their abilities as well. In essence, this could be a 5/5 with death touch, a 2/2 with nothing, or a 13/13 with death touch for 5CMC. It's variable and depends on the board state, so it could very well be a dead card in our hand. Without an option like Chord of Calling or Natural Order to find this card, I don't necessarily like it, but it is an option in it's own.

Second Harvest

Second Harvest is fantastic. It simply doubles the amount of tokens we have on the board, which is amazing with our deck. I would like to play this card, but I do not know what to replace with it as generating snakes in the first place is more important than doubling them. You can't double zero.

Throne of the God-Pharaoh

Throne is wonderful. It's a 2CMC legendary artifact that makes our opponent lose life equal the number of tapped creatures we have on the battlefield. With the amount of tokens we have, this will be a large amount of life lost each turn.

Key to the City

I have been fiddling around with Key to the City and it is great. It allows Hapatra to get through for some snakes and is far more efficient than Soul-Scar Mage is at making -1/-1 counters thus far. I may end up removing the Soul-Scar Mage combo completely and adding in Key to the City.