Definitely an interesting take on the Muldrotha, never quite seen a storm based one, it makes sense with the infinite casts. The durdle is sort of the point, mainly to keep opponents off of me and onto other opponents while I combo off, ya maybe not the greatest, but does work enough of the time for the theme of the deck.

I already have a storm deck and 2 other decks that utilize aetherflux, no need for a 3rd, however ballista is a good one.

Mana rocks aren't the best synergy for muldrotha I agree, but good if your LED or other 0 drops get exiled and I play against a guy fairly regularly playing an exile deck.

As for the rest, well some interesting cards that I overlooked or didn't see in other Muldrotha decks, I'll give them a shot.