The spectral cards are all quite powerful but the downsides are often way too harsh. Particularly when it comes to jokers. Adding a special edition to a joker you already own is hardly ever worth destroying all of your other jokers.
I'd really only make these changes:
Hex - Destroy one random joker instead of all
Ouija - reduce downside from permanent to only the current ante
Ectoplasm - reduce downside from permanent to only current ante
Ankh - Destroy one random joker instead of all. Negative enhancement jokers retain negative.
I like that there are downsides to the cards and that does weigh in the factors to use them but permanently crippling your run for a 1.5 mult or a copy of a joker is way too steep a price if you ask me.
Thoughts on how this could be done?