The Thrall of Fraz-Urb'luu
from Dragon Magazine #333 has a remarkable ability. People have often commented on its capstone ability, Alter Reality
before, and it's good, but the 5th level ability Staff Mastery
, is even better.
Staff Mastery (Ex): Upon reaching 5th level, you have mastered the use of magic staffs in emulation of your demonic master's skill with these potent magic items. You can now wield any magic staff, as if it were a +1 greatclub, at no risk of causing the staff itself damage. In addition, the staff is treated as an evil weapon for the purposes of overcoming damage reduction. You are considered to be proficient with the staff for this purpose.
You can use any magic staff as if its spells were on your spell list. Additionally, you may opt to activate a staff using your own lifeforce rather than expending charges. For each charge that the staff activation would normally consume, you instead take 1 point of Constitution damage. If you don't have a Constitution score, or are for some reason immune to ability score damage, you cannot power a staff with this ability and must use the staffs charges to manifest its spells.
Take a level of binder to bind Naberius to get Faster Ability Healing
to heal your constitution damage, and you have unlimited ability to expend charges from staffs.
Where the real power is shown is when the staff contains a spell that normally requires XP expenditure. Staff of true creation? Staff of simulacrum? Staff of whatever you want now that you are a virtual god?
You can enter at 7th level at the earliest, and must be chaotic evil (perhaps your your DM will allow you a different alignment adaption). Whether the DM will throw the players handbook at you for deploying this PrC is another matter altogether.