Add cost reduction spells like Helm of Awakening or Etherium Sculptor and win with Sensei's Divining Top and commander. Draw deck, play all the fast mana. Win with Laboratory Maniac or Jace, Wielder of Mysteries ...

They are in the deck. I already have enough win-cons I don't think I need Lab or Jace.

Maybe consider Muddle the Mixture ? Counter spell in general but can tutor for either combo piece of Dramatic Sceptre, finds Counterbalance, stax pieces like Torpor Orb or Rest in Peace, finds Cyclonic Rift which you are somehow missing....

Winds of Rebuke seems like an odd card in here. I get that you want the mill to look at some fresh cards on top of your deck but I think there is better removal or ways of doing that.

Portent is the slow Ponder but you can use it on opponents which can be interesting.

Protecting a 6 mana commander might be important so I suggest putting in Lightning Greaves .

I have muddle the mixture, I guess it didn't get saved.

I don't think rift is good enough in my meta that's why I use winds of rebuke that can also save my commander.

Other two cards I simply don't think are good enough to include especially boots when I run only three creates

Labman or Jace are better wincons than mycosinthe lattice and vandalblast. They lower your curve and are more resilient. But i can see you know all about the meta and edh so i wont say acword no more. FYI cyclonic rift is the best bounce spell in the game...

I don't think lattice is that great neither, but I run both Karn (more so for recovery reason) and vandalblast, so lattice is another card to make both of them into win cons

Cyclonic rift is good in more casual meta, it's not that easy to solve overloaded rift if it's relevant. Over 95% of the time rift is being used as single target removal in my meta. The effect of overloaded rift in very competitive table won't be enough value mainly because cEDH tend to win way faster, much fewer permanents played, and cost of permanents are generally very low. Sometimes you might even be helping an opponent to ramp because he has Mana crypt or Mana vault tapped etc

Jeskai ascendency for lots of value, way to profit off infinite spellcasts. Rift is a must have.

Jeskai Ascendancy is a good way to manipulate the top. I just wish the first clause can be a bit more relevant (No! I am not going to voltron with my commander)

Cyclonic Rift is not included for the reason I explained above. People keep suggest it but unless a very good argument can support it I don't feel it's a must-have in this deck, at least for my meta.

2 creatures does not seem like the right amount. 0 would be good because of Proteus Staff lines, and 5+ would be good because you could run star package and more Cloud Key effects for your combo.

What other creatures are worth of including? Ones I thought about using was Grand Arbiter Augustin IV but didn't fit the theme, and Dockside Extortionist but didn't make into the cut. I don't like the Proteus Staff build, but rather I like to have more control and versatile line of plays. Mycosynth Lattice really isn't a good card in cEDH but this deck can afford to run it, which I felt was interesting enough to include

I see you are considering Stranglehold but maybe it's a good idea to run Aven Mindcensor instead? It's a strong reactive card and can be played from turn 1, I have a lot of succes with it in my meta. Torpor Orb should be cut in my oppinion, you are an artifact oriented deck so Trinket Mage or even Tribute Mage would be great additions. Without the Orb you can also play Gilded Drake which is the strongest creature in blue on it's own. I would also replace Arcane Denial with Remand, letting someone draw two cards is to big of a downside in CEDH. Winds of Rebuke is in essence a way worse Cyclonic Rift, you run fast mana and "Sol" artifacts, being able to cast Rift from turn 3. If you manage to resolve it, you have won and I think you don't need a better reason to play Rift ;). But, if you really don't want to play Rift, then play Chain of Vapor. It all comes down to personal preference and your own meta ofc. but those are my thoughts on your list.

I try to avoid using creatures for obvious reasons: commander can't cast creatures from top.

The only two creatures I included are win cons.

Torpor Orb is very strong card especially now Thassa's Oracle is a big thing.

In cEDH deck you don't see people commonly run rift, main reason being it's 95% going to be used as single removal therefore chain is better. I like the versatility of Winds of Rebuke: it bounces threat, can save my commander from dying, disrupt commonly used library top tutors (mystical, enlightened, vampiric, imperial seal), and can manipulate my top of library. Therefore, Chain of Vapor can be an addition but not replacement for my consideration. Cyclonic Rift is not considered, it is a big advantage, but it really doesn't win the game.

I also don't see a big problem in Arcane Denial that opponent draws two cards. In cEDH quality is way more important than quantity, being able to deal the right thing is more crucial. Especially in cEDH, cards are very low curved, Remand sends back to their hand, but threat is still there and they can probably still replay it. I do see the upside that it can bounce my own spell being countered, but overall I think Arcane Denial less restricted and easier to use.

Was this the list you played in our game?

Correct. We just played

Nifty.

What about Dockside Extortionist? Should't he be included for increased ramp?

Not critical to the deck. You may swap out a mana rock for him but I chose not to because I can't search for him, I can't play from top, and torpor orb affects him.

So like... a peep show?

weird.