True.
However. To do that requires having six+ mana available with both the Electrodominance and ‘walker in hand. The question is why spend all that mana when I could have killed the creature with Path/Oust then played my walker and got value earlier? For the same price I could also play Jace, Brainstorm Terminus to the top of my deck then on the opponent’s attack step Opt and Terminus them. ‘Dominance seems like a lot of effort just to not tap mana on your turn.
Trophy is the only option that sees play, though Bedevil *might* make it. Your walker can still be Bolted, and if all that happens on end step then you get no value from the walker and it’s just a waste. The same result may happen if you mainphase said walker, but at least you can use it once.

Playing Teferi with Electrodominance enables you to kill a big guy, and then untap with all your mana to protect it. Playing a walker at instant speed enables you to play a wrath right when you untap to make sure it won’t die to the ennemy board for instance. How many instant speed removals can you think of for PW in modern though ? I can only think about Assassin’s Trophy.

The same things were generally true of Kiki-Chord lists, and they didn’t work out. The problem with engine decks is that if the engine gets disrupted the whole thing turns into a mediocre pile of medium-sized creatures opposing decks may not have to care about. Successful engine like Survival of the Fittest and Birthing Pod have been cheap and hard to kill.

You aren’t wrong.
However the catch is that Collected Company forgives a multitude of sins. There’s very little grindier than the Company, Eternal Witness, and Tireless Tracker with Gavony Township backup plan that Counters Company includes. When something goes wrong with your plan in current Kiki-Chord decks, you’re playing off the top of your deck. The Company decks can just Company themselves back into the game. My point is that everything about the Vannifar plans looks like a more vulnerable and slow version of Counters.
Your sequence is true, however Company gives the Druid decks the option to simplify to turn 2 Druid, turn 3 Company find the combo or get a lot of value. It’s more versatile.

Oh yeah, forgot about that one. Having three Modern relevant abilities also makes a modal spell playable.
That seems really questionable to me. What’s the benefit of a more expensive planeswalker at instant speed, other than playing said walker at instant speed? Unless you’re doing it in your mainphase, you can’t use the walker and it’s not like there’s no instant speed removal for walker’s available.

First of all, the Druid deck has very few ways of grinding through removal, whereas “kiki-pod” back in the day was actively good at that. There’s no reason why Prime Speaker has to be an all-in combo deck. Hatebears exists as a deck (although not being brilliant), and you could (and probably should) take a similar route with Vannifar. Playing a slightly grindier toolbox deck with a combo finish seems better than trying to race storm with a 4-drop. Devoted Druid decks try to race, not interact. That won’t be the same for Kiki-pod, at least that’s my gut instinct.

The second point which is overlooked, is that you can give Vannifar haste. It’s pretty easy to go T1 Dork, T2 “something that will give Vannifar haste”, T3 Vannifar with haste, win. That’s a similar number of cards to Devoted Druid, and similar speed. So there’s the potential at least to be comparable to Devoted Druid, and also the potential to be grindier (the combo pieces for the kiki deck require Renegade Rallier and Restoration Angel, which are already grindier by design).

That’s why I think the comparison with Devoted Druid is inaccurate. Thats not to say Vannifar isn’t without fault or that it’ll even be a deck worth mentioning – just that I felt the analysis was a little inbalanced.

Your points make a lot of sense but she is also being played in a strategy that is going to demand alot of removal every turn which taxes their answers pretty heavily

Secondly she works pretty decently without even comboing as a straight value play.

She is the only one on this list that I think is likely to have even a medium impact and it’ll be fringe.

Also I have a deck that can use repudiate/replicate. But noone else plays my deck and it’s not like I’ve won anything more than a few ~30 person FNM’s with it