Iv played this deck a lot and the only thing I can say to describe it is iv moved a lot of cards in and out but this list not only wins but when played correctly has forgiven my mistakes so much I literally named it forgiveness. I don't really have any instructions on this besides play it by ear and get lucky.
the suggestions are kind of interesting because iv ran both in the deck and they slide in for sif almost always but i wouldn't say shes wrong or better but that all 3 of the cards are situational. you only get about 2-3 of the discard cards a game and at best you really only want to play like 2 (again you have to play to see what im talking about) and the 2 you play matter. gambit has felt the worst but he can clutch out a good snipe just not often enough to love running him, hell cow is probably the best of the 3 just because you can catch up if you have it and a bricked hand from the jump to jumpstart your Hela and sif just does her job as usual aka the safe play. as a side note I tried Black Cat... don't.
All is forgiven.