Imagine having a hero like the Concoctor, low mana, decent health and a special attribute symbolizing the number of 'potion bottles' he has. Run out of mana, you can't create potions at random or cast basic spells to stall chargine enemies. Run out of potion bottles and you can't create potions (maybe with a high level spell you could?).
Would be the perfect support character. Throwing different types of potions (exploding, poison, burning, acid, etc.) or spraying your teammates/hirelings\pets with a healing mist from a large vial (WC3:TFT Inspired) or of course, the Transmute ability, turn a monster to Gold (also WC3:TFT Inspired).
Character would most likely be restricted to smaller weapons (nothing savage, maybe daggers, throwing axes & shortswords) and a powerful class-related weapon like a powerful all-effect of magic-effect potion?
If Blizzard makes some sort've contest for concepts, for D3, who here would like to see the Concoctor?