A thread for suggestions regarding more useful preperations as many are never used.
I suggest to have a preperation where you can influence the altars in a similiar way to glyphs.
Some way to reduce scumming without taking too much randomness away, so you're not punished for unlocking something you won't use on a regular basis anyway.
Something like assigning three gods to a preparation and when using it, it is guaranted that one altar of this group is spawned, something like that.