"Mahdi's the specialist but for prepared casters - like clerics and wizards - who either receive the spells in advance from our god just ready to deploy when asked, or complete the spells most of the way in advance ready to finish when asked - there are certain configurations of magical energy that are stable, and most aren't. If you do something that's unbalanced then you can't store a spell indefinitely like that. So our magic ends up - discrete. Either something requires a first-circle spell slot or it requires a second-circle spell slot but it's never halfway in between. - I think they're called circles because of something that wizards came up with, I do not myself have an intuitive felt sense for what makes a spell belong to a particular circle of power. Researchers try all the time to figure out how to compress a wizard spell so it uses a lower spell slot. Cleric spells just are what they are, mostly, maybe with a little bit of give in an emergency. - divine magic used to be unambiguously much more powerful than arcane magic but now arcane magic is generally considered more powerful, so much more has been invented. I can try to give you a sense of what spells are what circle but it takes a while to get an intuition for. Uh, something like creating water, or stabilizing a dying person, or creating an illusory light, uses very little energy and I can call the energy right back into my hand as I cast it, we can do those an arbitrary number of times per day. Invisibility is second circle. Flying is third circle. Scrying is fifth-circle for me but wizards recently figured out how to compress it into fourth, which means it's much easier for Mahdi to do than for me, so he has to do all our scrying and he mopes about it constantly. Teleportation is fifth-circle for wizards and plane shifts are fifth circle for clerics, wizards can't do a plane shift until seventh circle.
Raise dead is fifth circle. Resurrection is seventh. True Resurrection, which doesn't need a body, is ninth. There are not stable configurations higher than ninth, you can do ridiculous things if you get that good at magic but you're not really working within the same system anymore. The vast majority of casters are not powerful enough to do more than third-circle spells, and lots can't even do that.
Interplanetary teleport is ninth. Wish is ninth. Miracle is ninth, Gate's ninth..."