nisaba
I'd use the method Gregory keeps recommending in answers to these sorts of questions: separate all the cards and air them out on a flat surface for a while, then when they have aired and dried (mustiness is usually a function of microbe life, so dry 'em out and starve 'em out), then shuffle the deck really well and place in a box that has something pleasantly fragrant in it: dried rosemary from the garden or even packaged-up incense sticks, if you're of a mind.
None of my cards have ever got musty. Ever. I'm a bit paranoid about cards and moisture, though, so I look after them really, really well, keeping them away from *all* sources of humidity.
None of my cards have ever got musty. Ever. I'm a bit paranoid about cards and moisture, though, so I look after them really, really well, keeping them away from *all* sources of humidity.