I would think that a dungeon that fizzles your spell book or steals your mana (fizzles your treaure card spells as well, of course)(maybe allow zero pip spells work, but myth minion would rule!) would be very different and challenging. Only pet spells, wand spells and equipment spells work. An evil wizard steals your powers (along with a lock of your hair) but forgot to steal your equipment and pet. Find the evil wizard, defeat him and get back your lock of hair (or talisman, or voodoo doll or whatever) to restore your spell power. That would make crafting, farming, pet leveling and equipment drops so much more interesting and less tedious a the upper levels. Bring a friend (or 3), this dungeon is ---> Challenging.
