There is a little context as to how Karn went back in time, He was designed to be a Time Traveler Originally (hence why he is made of Silver, it is apparently immune to the damage from time travel) and he has traveled back through time before, so he has experience with it so going through a "Time Rift" to a specific spot in time isn't a huge leap for him to do.
Doesn't make much sense still though, but..well Time magic in MTG is strange anyways. *looks at Sarkhan*
Not Every Blue deck can do all of those things.
Blue Tempo has an inherent fail rate, The Izzet Decks Draw a load of cards yes but they fill the deck with Churn so they don't have as many control aspects and The Esper control doesn't have that many Draw effects or Win Conditions, saying "Blue does everything" is really simplifying the format.
I think Yawgmoth would end up on Esper. He started as a heavily Science Based Doctor who allegedly infected people just to create a cure and used that to gain personal and political power, Alternatively a White/Blue Creature card that flips into a Mono-Black God.
He better not be a Planeswalker.
Both and more, given that every plane has it's own genre.
It is much worse than that, Bolas needed the Planar Bridge to work exactly how it does for the plan he created 6 decades ago to make sense, Rashmi forgets to carry the 2 and now the Planar Bridge can transport flesh and non-flesh? Well you wasted the majority of your army by having only 1 Eternal per crop. Rashmi misplaces a decimal point and now it can only take flesh and not non-flesh? Now that Eternal Army is completely useless.
For Phyrexia to be a threat they need to have a perfected Planar Portal, So they either need to just happen to make one in time for them to be "dangerous" or for Tezzeret to simultaneously lose all good sense and give them his if the still has one once War of the Spark is over, then he needs to very suddenly perfect it despite already having months of time to tinker with the thing.
Also don't forget we are in the Post-Mending Era of the game, which came about because they wanted Planeswalkers to be "special" and got rid of things like Planeswalkers being able to take people with them, Planar Bridges and the Weatherlight very much on purpose.
Because it is good writing to have the Planar Bridge that the badguys require for the plot too work to just suddenly fall into their lap at complete random and then have it happen again in the very next "major story arc"
I think so long as nothing is "broken" like Marvel or Token Cat Lady I am not sure they really care too much how standards end up shaking out. Why would they? there are 2 years for Multicolor to shine (not like it doesn't shine all the time anyways) I am honestly glad that there is a straight mono color deck that is still good in a Multi Color format. it proves that good mana doesn't always devolve into "4 color good stuff"
Very likely not, Vintage Dredge only needs one card to really have a keep hand, it is in the very least going to increase Dredge's game 1 performances, this very possibly has a positive effect on shops too since you can get Mishra's Workshop and Lock Piece in opening hand a little easier. This could end up with Bazar and Shop getting restricted.
Depending on the match up, that can be irrelevant.
Cabal technically before the Patriarchs character assassination in Odyssey block
Sorry face it, it is likely the writing will be worse than BFZ then.
The Shieldmage from Alara was White/Blue so Teyo could be an Azorius "Good guy" to balance out Dovin (and Azor sort of) being bad guys.
The problem is that it doesn't target, so chances are it won't hit Multani with the bolster effect most of the time.