Our party is currently looking for a way of destroying or heavily damaging a castle-like mansion. It is a tall stone building, roughly 45×45 meters. While researching the ways of doing it, our druid recalled that he can Move Earth from under a castle. A 5th edition version of the spell is more thorough and mentions that you can lower the earth's elevation and that
If the way you shape the terrain would make a structure unstable, it might collapse.
However, it seems that 3.5 version of the spell can only move 10ft.-deep chunks of earth.
Will 3 casts of the Move Earth spell (e.g. 30ft. of earth gradually removed from under the half of the building) be enough to heavily damage or topple it? Or will our druid just create a Pisa-like landmark for the people living nearby?