Ideas and suggestions.

It's clear that further skill improvements are planned, but my main point was that Estate and Mysticism in their current form still remain practically useless. I hope they get buffed more in the upcoming bugfixes. As I previously suggested, 10-20-30 and 500-1000-2000 sounds quite adequate and constructive; they won't become overpowered, they'll just become good skills.

I agree, they still need a buff. But not too much.

When buffing Estate, remember that it stacks with artifacts that give gold. Right now they're useless, but if it's buffed too much, even just a Purse would mean 2500 gold out of thin air every turn (a new hero every day). And what if you have a couple of heroes with Estate? What if it's not a fast Jebus Cross with a finale on day 123 or earlier? If the game lasts several weeks and you've collected the Golden Goose? Then the game would become a bit of a farce.

IMHO, a maximum of 500/750/1150. We shouldn't focus exclusively on Jebus Cross games. Such skills shouldn't have a significant impact in short games.

But such a hero, if hired specifically for that, should also pay for themselves. If we take a 7-day finish as a baseline for various Jebus Cross maps. Then a hero with level 1 Estate would give 350*7 = 2450. So they wouldn't pay for themselves. You'd need to level them up, but for such maps that's too difficult and the hero would still be dismissed. But if level 1 gave 500, then 500*7 = 3500. If that seems like a lot, make it 400, so 400*7 = 2800.

It wouldn't be overpowered, because leveling a support hero up to maybe level 5 on Jebus Cross is questionable. I don't think that would be an overpowered winning strategy. But starting with a hero that has Estate (if level 1 gives 500 or 400) and engaging in more expensive bidding could diversify the game and the hero lineup! And it would force you to keep such a hero for 7 days, otherwise the strategy would be a loss.

If Mysticism is buffed too much, early-game battles would become almost meaningless, and 30 mana out of thin air in the late game would be too strong. IMHO, it's sufficient as is, people just haven't realized it yet. If you fight smartly, such a mage can avoid restoring mana by collecting respawns or, after waiting a couple of days without serious battles, restore the needed mana for breaching GO (without entering a castle or well).