Heya,
These are all very interesting suggestions. Thanks!

Chalice on 0 or 1 seems pretty rough, as does an opposing Rod. Have you found it difficult to hit Rebuild mana when cut off from artifact sources?
This is true of any storm deck. The fact that this deck has built in mass artifact bounce effects at different casting costs gives it a leg up IMO. In addition, having Sol Ring, Mana Vault, and Grim Monolith gives this deck some protection vs. Chalice at 0. All the zero cost artifacts give this deck protection from Chalice at 1.
No way is Retract better than Hurkyl's.
You need to try it before you knock it. Retract w/Tops is awesome.
I'm also 90% sure that Opal/Grim should be replaced with Key/Vault. Yeah, it's boring. But just do it. Key is pretty good with that many Tops (which might be excessive).
That would lead this deck more towards being a Tez deck. Why bother with all the Rebuilds when Tez/Jace already have such efficient builds?
Do you really need Tendrils? Especially with the splash of red (which I like), getting double black seems counter-productive for the deck. Also I think Fact or Fiction, Gifts Ungiven, and Jace, TMS are better than Vamp, Scroll, Ponder, and Preordain. The deck doesn't seem like it accelerates well so tutoring and early digging is just watering the deck down.
That’s a very interesting insight. Maybe a U/R Deck with more focus on draw effects would be a good build to test. You lost out on Yawg’s Will though. That’s a bummer.
If playing 3 tops, grim monolith, mana vault, mana crypt, and sol ring Voltaic Key should be an auto-include, and if you have Voltaic Key and Tinker, then time vault should be an auto include.
I see what you’re saying about Key ant Tops. Interesting thought. To me, that takes the deck in a new direction- which is just fine. It gets tempting to add Riddlesmith and Etherium Sculptor to the list at that point.
I personally would drop the tinker bot to the SB, and make it a time vault, and I also agree that Retract is nowhere near as good as hurkyll's in this MUD heavy meta.
Putting Tinker-Bot in the SB is hard for me to do b/c it is such a win-from-out-of-nowhere thing. But I do know that other Storm decks are starting to do that, so it is a legit suggestion. Retract is really good, but replacing them with Hurkyl’s is something that could be considered. The problem then becomes finding a way to bounce your own stuff after playing Hurkyl’s on your opponent.