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Personally, I think that when you combine Simic and Golgari, the focus should rely more on evolve because it just tends to work better. Cardwise, I would say take out the 4x Simic Fluxmage, 3x Fathom Mage, and 3x Deadbridge Goliath. In their places, I would add 3x Primordial Hydra, 2x Abrupt Decay, 3x Increasing Savagery, and 2x Bioshift, for starters. In my experience, pumping creatures up with evolve and Increasing Savagery is easier than relying on scavenge. Also, Primordial Hydra is a great card in this kind of deck, especially with Corpsejack Menace, so I would definitely reccomend putting at least 2 of him in.
Good luck, I hope you deck turns out really good, and feel free to look at my decks if you want to. Happy deck building!