I did about 20 runs of Ulduar, I guess, all on 25-man. I think I got 4 or 5 Winter Rageling
s in total.
Hard mode for Hodir just consists of killing him fast, so I would naturally have done that every time.
They're cheap enough and plentiful at the AH, if you want to give up and buy one. I'm sure I have a spare, too, if you need.