Gaian... because the few cards that I personally see as really unattractive totally ruined what could have been a lovely deck for me... :-(
Crystal Ally, because I remembered them being cardboard, but they were plastic by the time I bought them, and I had a memory (misguided) of much more gentle graphics...
Osho, for reasons mentioned by others...
Doreen Virtue decks, because they tend to recycled versions of her very first deck, and it is all too warm fuzzy and sugary for me (apologies to DV fans...). I just can't read with that...
Unlike a real collector, I'm happy to forward decks that I can't relate to on to new homes
The above left me a while ago, and happily were loved by their new owners