My thoughts on the wacky spells is that ultimately, the Winds are conceptual. Theres no "this Wind cannot do this", theres "have you twisted it into enough knots yet?", because their basis is on a completely different axis to reality.
And THAT is probably the roots of High Magic anyway.
Take a weather spell: Azyr has the most direct affinity for it, but you have Ulgu contesting the clouds(and everything in between cast with shadows at random), you have Ghyran contesting the water, you have Ghur contesting violent windstorms and such phenomenon, you have Hysh released from flashes of lightning and rainbows.
You can use Azyr to manifest the raw phenomenon and let physics take over. Hopefully its landing on what you really want.
Or you can use ALL the Winds involved and Assume Direct Control.
When it comes to whacky bullshit that Ulgu is apparently canonically able to do:
Banish Illusion
Destroy Illusions
Steal Hysh's schtick by fucking with other illusionists!
Probably the easy one, Ulgu controls illusions, so theres no reason why any kind of illusion manipulation would be hard.
Its sort of like the Second Secret, normally you can't dispel a construct once its formed, but if you know how it works you can dismantle it instead.
Finger of Life
Healing Mists
Heal people, because why not?
I'm not sure how Finger of Life works, but Healing Mists sounds like "Ghyran can heal" -> "Ghyran is water" -> "Water is just mist being boring" -> "Mist is Ulgu"
You know, the thing Supersonicsound is very enthusiastic about?
Crown of Taidron
Shoot laser beams out of your head!
Apparently it shoots lightning?
This one looks like it's confused enough to think its Azyr.
Pit of Tarnus
Make a big hole. Not, like, a hole into the shadow realm or anything, just an actual hole in the ground. People have to dig out of it or be buried alive.
This looks like someone miscast Pit of Shades and decided to claim they meant to do that.
Radiance of Ptolos
Make someone glow so bright they're painful to look at. Yes, this is a spell in the lore of shadows.
Ulgu can make Marsh Lights anyway, Malfean Stealth is A-Okay
Ranald's Mischief
Sounds like there was a fellow Ranaldite among the Grey College, because this spell was fucking stolen straight from Von Horstmann and the Light College, doing the same "attribute swap" thing as Horstmanns mirror.
Ranald: "Hey, hey Mathilde, I got an idea for this Theurgy thing."
Stormcall
You see, Ulgu is the opposite of Azyr, so just like Azyr can clear skies, it makes perfect sense for Ulgu to be able to summon storms. No, wait, that actually makes no sense at all what the-
It brings a Dark And Stormy Night.
Storms are super rich in Ulgu, since theres shadows everywhere, theres mist everywhere and theres clouds everywhere.
Ribauld's Retroactive Illusion
Yep, Ulgu can fuck with time.
Those last two are probably even canon to Divided Loyalties to some degree, since Melkoth was stated to have fucked with time to obscure his age in-quest, and Boney mentioned that the Elven mist-mages use Ulgu's associations with mundane winds to speed up their ships, and it's not that far fetched to go from wind manipulation to weather control.
Based on the other spells I *think* the Grey College was doing some oneupmanship on the Celestial and Light Colleges in a lull period, because the spells are thinly veiled ripoffs of Azyr and Hysh spells, using Shadow and Mist to do what Sky does, and using Confusion to do what Faith does.
T-Pose