For the last two decks for "Round 5 Decks", I think the death-water poison deck would be a good choice for #7, and either mono darkness or another rush rainbow, or the CC rainbow. Yea, I think another rainbow would complete our vault nicely, but that's just my thoughts.
I haven't tested the fire stall, that is the only one I am shaky on; the rest look great. I don't see any changes I want to suggest. We're almost there. 37 hours to go.