One Upon a Time …
… there was a Standard format that was quite out of balance.

Immediate Impact
The first thing we notice is a massive drop in price for

Now the sky isn't completely falling for this card. Being a free cantrip has proven to be absurdly powerful in the past—looking at you,
What about Oko?
Well, there's not going to be a lot. Not a lot of Standard play, but also not a lot of price movement. The community was talking about how Oko should be banned right after Mythic Championship V and since then Wizards had communicated matters in a way that made it fairly obvious that they would change Standard in a major way after Mythic Championship VI.

When everyone knows a card is about to leave, they plan accordingly. As far as the market is concerned, the ban had already happened. Indeed it would have had a much bigger impact on the price, had Oko not been banned.
This is why you shouldn't wait for a cheaper opportunity if you're looking to get some copies of the 3-mana walker. They're not going to go a lot lower anytime soon. The opposite may be true: as soon as players realize that the price is not dropping, they will jump on it too. So secure yours sooner rather than later.
The Legacy of Wrenn

People didn't expect the banning of Wrenn and Six either; this is why the price graph looks so similar to the one for Once Upon a Time. It also shows why it's particularly problematic when Wizards overshoot the mark on cards that don't ever make it to Standard or Pioneer. The only demand for the planeswalker now comes from Modern players. This is somewhat of a first in Magic history and the existence of Pioneer is new too, so any prediction remains wildly speculative. That said, I would expect some (further) recovery but not a full recovery.
Everything Else
Wizards have once again sent us into the wild west of a format. This seems to be their strategy to keep the game fresh as I outlined before. Everything as well as nothing might be viable. Without Oko, you can once again reasonably slam
If you want to profit off of this new Standard, you'll have to figure out what the newe broken flavor of Magic will be.
Opinions expressed in this article are those of the author and not necessarily Cardmarket.
