To be honest, I totally lost track what each individual player could do at the end of the campaign and basically relied on the honor system in regards if they played their characters honestly. As you can see, my player knew what he was doing.
Yeah, Magnuskn, th3M1ghty, it's clear you've got some very fiddly stuff running around, and extremely optimized, and I still don't think you can do this the way you have been, RAW.
One key problem being is that someone coming out of a time stop doesn't have a "readied action" available. A "normal" time stop, works like this:
Out of a whole round, you have a standard, a move action, and a swift action available. The caster uses his standard action to cast Time Stop, and acts for the duration in rounds. This is outside the normal time flow. You can't carry a action from outside the timeflow into the timeflow, so when TS ends, you have a move and swift action left over from the original turn. If you have ended your "time in Time Stop" preparing a readied action, the action needs to be performable with either the remaining move or swift actions. Or the action waits until the next turn.
As mythic you can pick up another standard action from amazing initiative (that "can't be used to cast a spell") and you could also potentially get another swift or even a move action from "Borrowed Time". But neither of these lets you bypass the rules on p213. Synthesis will let you workaround the p213 rule once per day, by combining a spell from your cleric and sorcerer "sides". That would get you to 3 spells per turn (once per day), which is still not 4 spells per turn.
To actually make your turn work, would require something like this:
Use Time Stop from a scroll (standard action, non-spellcasting)
Use nested time stops - your own castings
Cast "many" buff spells
exit nested time stops (free action)
Use Amazing Init and get another standard action (Free action)
Use Synthesis to cast both Greater Dispel Magic (Cleric spell) and Limited Wish (Sorcerer spell simultaneously). (Standard action, casting)
Use a Greater Quicken Rod to cast " mystic augmented empowered spell + consecrate spell prepared divine desintegrate" (Swift action, casting).
You've spent roughly 100,000 more GP on equipment. Maybe not a big issue.
On a bigger issue, "Wouldn't have saved Deskari in the long run (i.e. after another round)." Magnuskn, 1) it does if the sorcerer is dead/incapacitated before his 2nd round, which is distinctly possible if Deskari drops a full attack on his head as I have described. 2) As DM saving Deskari is not the point. The point is to have an epic fight. If Deskari puts a PC or two down, it's a lot more interesting. Clearly you were massively jaded by the time you got to this fight, but if Deskari's not nuked to death's door, the ranger can't easily kill him and then Areelu also gets a turn, with her own ability to pull TimeStop, using Wild Arcana... things snowball in this kind of fight.