I've got one player who makes horribly complicated builds like that, but has the forethought to make sure to hit certain capabilities at the right times.
Heh, so at least Maho-Tsukai has been noticed before.
OA/UA/SRD taint applies a penalty to wisdom score, 1/2 of taint. Spellcasting DC becomes 10 + spell-level + taint. So DC can increase much faster than the normal rate of ability score modifier.
However, this puts you at risk of death by allip, wis poison/etc., and failed wis saves. The classes themselves have bad will saves.
Tainted Spellcasting risks increasing taint score each cast.
ex. 17 Wis, 14 Taint: 10 Wis effective: 10 + spell-level + 14
HoH splits taint up into Corruption and Depravity, and uses at table that sets your taint limits based on the respect con & wis scores.
The same risk applies in terms of death by ability damage, if you get pushed too far on the table.
Tainted Spellcasting is safer since there is more headroom for increasing depravity through casting spells.
p.66 has the OA adaptation
Bonus Spells and Spell Level are determined by Depravity.
Spell DC is determined by Corruption 10 + spell-level + 1/2 corruption.
Because of the way the table scales, you effectively become a Con based caster, acquire severe corruption, and fire off DCs twice that of standard spellcasters.
ex. 17 Con with 30 Corruption: 10 + spell-level + 15
The dirty trick interpretation is that from p.62 an undead player could acquire infinite corruption with no drawback, and thus an infinite DC.
Took me some thought on slave prices for Dark Sun. I figured 1 year of hireling time was about right, and that's about in line with the FRCS statement. It is one of the players themes as he is a Thrallherd. He wasn't too excited when I mentioned survival upkeep after getting some price quotes, definitely more excited about disposable believers