Spoiler:
Spoiler
Contrary to what the description says, I do believe that they can use rings, so the Ring of Gaxx, found at our most favorite demilich of all time is one of the regeneration/ Improved Haste sources. Foebane +5 is a draining weapon, although it's found as two different pieces, it has to be upgraded to the afore mentioned status. Arbane's Sword +2 can be a good source of Haste (+1 attack and double movement rate) early on, as well as the Chaos Blade for Draining. Adjatha the Drinker +2 is found in the Planar Prison, also early on. Blackrasor is an excellent draining weapon for Wizard Slayers, especially ones that hit fast. And, depending on your alignment, if you get Vampiric Touch, you can cast it on yourself to heal damage as well as to give yourself some extra hit points.
The fighters aren't too much of a problem.
Through weapons alone, I can think of a way, right off the top of my head, on how to get up to 6 attacks per round. That's some nice spell failiure/drainage right there.