you can donate different resources , the witch points go up per resource you donate but you can switch between the resources so if ur coins are lets say at 2m already for new witch points you can just switch to another resource that still are at low costs to get witch points.
This is
very important information, and I did not fully understand that when reading it the first time.
I want to highlight this again, especially since this is something I did not expect at all Oo.
That is completely counter-intuitive for me.
The
number of witch points you get
is disconnected from the resource selection.
In contrast to for example how trading with the wholesaler works.
When you (for example) donate Gold, the number of witch points you get goes up to for example 300.
Then when you change to stone, you will also get the same 300 witch points (for the current amount you need to pay stone)
So when you use one type of resource, the number of witch points per certain amount of that resource sinks.
For example when you donate gold, you might need 395 gold per witch point, while after that donation you need 407 gold per witch point. (122k for 300 witch points)
However, when you also donate one time from all the other resources, you can need approximately 394 gold again per witch point.
Meaning: if you do that all "very evenly", then the price per witch point might not increase, just the amount you need to spend in one donation.
You might reach a point where you need to donate more gold than you can store though.
Similarly, you might need to gather resources for a week to make a donation, but you get lots of witch points.
Short: Witch points don't get more expensive, just the size of the donation does get bigger. (if these numbers make it into production)
Using gold donations whenever you have some to spare seems to be a good strategy (same for supplies, if you don't use all for training).
You can only hold a certain amount of gold and supplies anyways.
This way your resource donations stay "effective".