Set trees on fire then place them over enemy buildings
This is a cheat not every one knows.
THIS WILL NOT WORK ON PRE-SAVED GAMES! You Must Start A New Game!
Go to the directory for Black and white 2, and find the file "GameBalanceArtefact" in \data\Balance\directory.
Copy the file to your desktop for safe keepings. You may need it later on.
Once done, open the file. You will see all these numbers= Tribute value of all the items.
Look for the most valued one-
Dont look at the other numbers, just change the "100000" directly to the right of any artefact. This WILL change the value in the game.
You may do this to every one. "BUT DO NOT GO BELOW 1000" This may make the game not work properly. But remember to change the total cost to whatever it now adds up to at the end of the file.