La Force
I have got startlingly accurate and not particularly dark readings from the Savage Tarot. That one is as dark as they come.
Nope not dark enough for me,
I had to check it out, too me it more S & M, Dominatrics, Dominant, submissive, sexuality, role play type deck, touched with suicide, murder, drugs, abuse, etc.
My dream dark deck, would be very dark, that it would scare the crap out you darker than all the SAW movies combined with diabolical demonic, pure evil. Then I would be proud to say I own The evilist satanic deck in the world.... Ohhhh that just gave me idea, hehe I make one, haha
ETA: I would then depict GOD as the devil card, total flip side. lol take that with a sense of humor