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Does Ruby Storm care about the new Underworld Breach?

Amethyst Storm for those using the Ruby Storm nomenclature.

You'll have them through their end step, but once you untap it's your turn and not theirs anymore so Act is over. To do the end-of-turn trick the card needs to say "until the beginning of the next...

Since the cards are exiled and not in your hand I don't think there is any notable interaction here.
EDIT:
Actually I think I misread what you wanted to know: The end step is still part of the...

You are right about everything you said, but it's not an answer to the question ;). As you said huf casts them all at once and you get to stack them. So huf begins resolving, you cast the spells,...

It doesn't matter. Huf casts them all so by the time the storm trigger resolves all the spells have been cast and placed on the stack. This also means no matter how you stack it the storm trigger...

So here's the problem I'm seeing: you have no protection and are using reforge the soul to basically let your opponent dig for an answer. I think this means that while you goldfish well in real life...