Veteran difficulty – at the beginning, you have 10 crystals (we're not considering the small chance that you might get crystals as a resource bonus).
Tans cost 20 crystals, and dragons cost 10. Let's assume you build dragons on the second week (you'll have 0 crystals left) (we're not considering the probability of finding free crystals lying around). You capture a ruby mine (let's assume the ideal scenario) around day 9 (free rubies lying around the mine will give you approximately 6-7 at best, let's say 7). Now you have a ruby income of 1 per day. So, to get 20 rubies, you need 13 days, which is almost 2 weeks. If you calculate that the mine was captured on day 9 (and if there are some High Druids or Archmages there, it will be a bit more difficult), then it takes 22 days. This means that after 18 days, the third week has already begun, and + 4 days, only then can you build Tans (if you follow this strict plan). But in this case, you won't have a Mage Guild, or maybe only a level 2 one. Furthermore, if you rush things like this, you'll lose out on developing your city (especially upgrading creatures, which is natural when you only have a Castle without a Tavern or Fort).
It doesn't look like a good plan in this case.)))
Maybe I'm not considering something correctly.
Please outline the construction and actions day by day. Because I find it hard to believe in the reliability of this scheme with dragons on the second week and Tans on the third