Wind of Change

Calculate the probability that the difference will be 6 days.
Your option, where there are two instances of 0%, is much worse. I really don't like the option where a player has to waste resources with a 0% chance.
Yes, this solves one "problem" by creating something like a "mirror Mage Guild," but then other problems related to "mirroring" will arise.

The probability doesn't matter. What matters is the possibility that in a tournament with decent prizes, the outcome of the game will be decided by random luck rather than the players' skill. And there will be a valid reason to laugh at our favorite game and say something like, "Haha, I thought this was the best turn-based strategy, but it turns out it's just another Hearthstone, only the match lasts not 15-20 minutes, but 5 hours, and randomness still decides everything."
Who needs this? Kostya, you?
Or maybe Zhenya LuckyF, who has already been upset about this randomness on streams many times?

There are no known problems with mirroring. There are problems with "mirroring." And, by the way, as Savitar - Aive's game in the CIS Online showed, even these problems are exaggerated.

In the 0%-0%-100% scenario, the player gets nothing. At least for now, the player rolls for level 4. And in the Tower, they roll for level 5.
And definitely, the player isn't wasting resources into nowhere. They pay a price corresponding to the real value of the spells we're talking about. Even if it takes a few turns. Well, 1) this is a very valuable spell, 2) we may not have a way to do it as it should be ideally, so this is just a way to implement the best within the available conditions. And ultimately, the player gets this spell at the right price. Right now, players are wasting resources into nowhere, getting Counterspells and Sorrows at the same time that their opponent has already gotten Town Portal for the same money.
All the work on balancing comes down to setting the correct prices for what we're talking about. Prices of 3-4 times 8 for Town Portal and 3-4 times 10 for Dimension Door better reflect their real value in the game.

Okay. We can adjust the price itself, but there's an idea that has already gathered enough support – the price should be fixed, or the price range for players should be minimized; this is key to understanding.
State at least some reasons for increasing the price range when this doesn't need to be done. After all, the price range is precisely what is currently the problem.

Lizzy wrote above that they discussed it with Zhenya and came up with a range of 2 rolls, and that's fine. ("getting the control spell exactly in 2-4 (3-5??) attempts")
And how did you come up with this? Why is a range of 2 better than 0? Why is 2 better than 1? How is it specifically better?
Imagine, simply, that you personally are playing in the CIS final, sweating for 6 hours, and losing solely because your opponent (with everything else being approximately equal) got Dimension Door 2 rolls earlier. That's why on h3dm1.
I don't understand at all how this can be promoted, especially by LuckyF.