We ended up discussing which spells would make the battlefield level last night; I suppose we would wish to pout a little thought into what the numbers might look like in the “fantasy combat table”, the one that gives you a 2d6 roll to drive back or kill a specific fantasy creature...choose the default level (8th?), look at the combat equivalent (superhero minus 1, I think) and then adjust for other special abilities, e.g. better against undead than the equivalent fighter, etc.
Great topic! I use Fighting Capability with CM-battles, a Bishop fights as Hero -1 etc. Same for Saving Throws. So basically only Bishop, Lama and Patriarch are allowed. Clerics have so few spells that I decided not to limit number of "slots". Bless spell is particularly powerful - can be a game changer.