The level one spell "Nahal's Reckless Dweomer" available to the 'Wild Mage' kit can be cast infinitely.
Also it cannot be correctly added to the quickspell bar: selecting this spell takes you to it's second menu where you select any spell from your spellbook and adds this to the quickspell slot.
Loading this save in a regular BG2 save also has the infinite cast issue. Quickspell functions correctly (add's Nahals... to the bar). Creating a new wild mage, the spell is expended on use like any other.