I don't know how aflatoxin could do anything against decks with rewinds, devours etc, unless you mean a quinted malignant cell to produce food for your scarabs, which I find not really useful as you can produce new scarabs as food (more expensive, but easier to build an effective deck around it).
Though a gravity shield would still work wonders against scarabs, unless you take momentum or some permanent control, but I guess momentum would be more reliable as gravity shield could be PAd.
And I am not saying pharaohs are better than fractal. I just say they are both good, probably fractal faster, but pharaoh better in stall decks. And if these two duel, I guess pharaoh could win, at least the deck I am testing right now against what I guess a scarab+fractal deck would look like.