I've been going for black deck gold stake for about 2 weeks now. The amount of times I've failed in Ante 1 is nuts. You pretty much have to have some kind of +multi joker instantly, as 3 hands and 2 discards is not a lot to try and make a functional hand.
Congrats on completing them all, that's awesome! Would you be just starting the challenges now, or do you just have a couple left? I just finished up blue stake for the decks and the only challenge I've got left is Jokerless. That one I think is going to give me hell, but the others were fun to go through!