Through reading some of the comments, if the chain veil is lost there is always the option of academy ruins. Of course this doesnt work if TCV is exiled. However as a player of this deck, there are enough counter spells to stop that from happening. And timing is also a factor. Playing tcv should be done when you know you can either protect it with counters or when you know that the other opponents cant stop it.

This deck does not want Mission Briefing.

why would you remove Manifold insights , which gives you 3 cards for 3 mana ? and why add careful consideration which costs 4 mana and is basically a worse thirst for knowledge..

A good way to view Manifold Insights is drawing the 3 worst cards in your deck. It is better in cEDH as one of a few draw spells. In a deck like this with so many cantrips, it could just end up slowing you down while tucking important pieces.

That being said, drawing your 3 worst cards is still usually pretty great, especially when opponents don't know what you need. It skips lands which can be good or bad, but frequently reveals a Mana rock.

What is the oppinion on Mishra's Workshop ?

Ediited from the Primer:

"Sometimes this leads to explosive plays that win you the game extremely early. Other times you just wish it was a basic island. Note that the card only lets you cast artifact spells, and not use artifact abilities. The card is overall counterproductive to the deck's control plan, and as such it does not belong in a Teferi build that is not all in on stax/fast artifact combo."

I wanted to ask for an opinion on sai, master thopterist if he would be good as playing kci he is great at stalling creature decks while drawing cards

Time Spiral ?

I've been running this deck on a shoestring budget, so basically all the high cost stuff I don't already own are out, so I've been experimenting with a number of alternatives.

One card I've had a lot of success with as a budget alternative to SDT, to the point where I feel it may be warranted in the mainboard, is Soothsaying. While it doesn't draw you cards, with one of the innumerable ways to get arbitrary large amounts (if not infinite) mana in the deck, you can effectively stack your entire deck, floating all the most useful cards to the top. Being able to shuffle your deck at instant speed is also potentially very useful, particularly when you end up having to put cards you need on the bottom of the deck.

While I wouldn't advocate replacing the SDT, due to the lack of ability to actually draw cards, Soothsaying has proven useful enough I thought I'd pass it on as a suggestion.

OUT: Careful Consideration

IN: Verity Circle

?

Or is Verity Circle being considered as more of a flex/sideboard slot, since it is tap out dependent draw, and needs opponents running mana dorks (or on facing Sisay, Yisan, Arcum, Baby Jace, Selvala, and/or Vannifar, if the latter ends up being A Thing)?

That is the swap I'm gonna be making once the set is released, yes.