Revelation as writen doesn't works for me with the last patch, but I used it as a template to create my own revelation spells, one for each magic type. (and thanks for the base effect by the way
)
Revelation: cloud reading (A1H2, Thaum 2, cost 2 air gems)
Revelation: lore of the ancestrors (D1H2, Conj 3, cost 2 death gems)
Revelation: holy brazier (F1H2, Thaum 2, cost 2 fire gems)
Revelation: secrets of Gaia (N1H2, Thaum 2, cost 2 nature gems)
Revelation: reading the entrails (B1H2, Blood 2, cost 3 blood slaves)
and so on ...
Depending on which nation I play (like Gandalf, I usually play solo, playing more against the map that the AI), I copy/past the appropriate spell(s) in a mod, sometimes with a small change (like maybe reducing the holy level to 1 for some nations)
As long as holy is not the main type and it cost normal gems the spell works fine, I can even use monthly casting.
Of course the main problem is that some nations do not have any mage-priests, and the only way to then cast those spells is empowering a priest or making a prophet from a mage.
