If the Devil represents a karmic bond, which could be, it must be a negative one...
I agree with Nikita.. In my own readings, The Devil did indeed represent a bond of sorts with my ex. Sure, we did have a deep connection/bond (karmic or not, I'm not entirely sure) that was impossible to break for many, many years, however it did more hurt and pain than it did good in the long run. I also believe the Devil was pointing at the fact that we felt chained or linked by each other, an emotional bondage, not being able to let the other go, and being stuck in a bad circle. Perhaps others have had more positive experiences with The Devil, I do not know, but this is just
my experience with it
My combos for karmic ties would be
6 of Cups & Wheel of Fortune or
6 of Cups & Justice. The Wheel of Fortune rarely shows up for me as "good luck" or "a new cycle", but more when something is fated or the power of the Universe. Therefore, for me, it can also show up as karma or when fate is taking over. When something is meant to happen, whether it's meeting a certain person or not being done with a relationship yet--regardless of bad or good--because you haven't fulfilled your lesson yet. Or, that something will turn and come back, such as karma.