I have run the nightfall over 50 times since the dawning, and the icebreaker still has not dropped for me :(
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You're all alone in that club. Most have run it 12X max. There's no point in running it more than once per character per week. You only get 1 chance with the Sunrise Bounty per character so going 0-50 is obviously a joke. I got my Icebreaker on NF #10. Yeah I was counting but honestly it wasn't a big deal when I got it. The gun isn't good. Hasn't been good for a couple years now. You'll get and I will wager you'll get it before you hit that 50 number otherwise you will be the unluckiest player in the entire game.