Re: Hidden in Sand does not work properly
 

According to Edi, Dust Priests have

Fixed E1D2H2
Randoms
100% FES
50% F
50% D

but I think that's actually two 100% chances of FES, or magic scale can improve the results.

Re: Hidden in Sand does not work properly
 

Hidden in Sand does have a high cost for the end result, but the real value comes with the dust priest with fire magic. The game has very few summoning commanders/mages which arrive with fire magic. So if you need access to fire magic then it could be worthwhile, but if you're looking for an army I would suggest living statues or mechanical men for a better deal.

Re: Hidden in Sand does not work properly
 

The Fire is just random, but I think the chance of getting at least some fire is good, and they always have Death so that ensures access to Flaming Skulls. Similar access to Earth/Astral is also noteworhty, especially if Astral 2 is possible (and ologm says it is).