Woot! I just opened my second Malygos. Kind of happy about that since I disenchanted the first to push me to 1600 dust for my Sylvanas. He's VERY situational but I'm starting to see a lot of Druids playing him.
Yesterday I got a Gold Force of Nature. That can disenchant for 800 Dust. So right now I've got plenty of dust to play around with. Just not sure the direction I want to go.
On a related side note, I also have a third Ice Block and a third Defender of Argus. I fully expect one, if not both, to get nerfed in the near future so I don't want to disenchant them just yet. Defender of Argus seems to be a likely nerfbat target and Iceblock has so much hate and people whining on the forums about it, it wouldn't surprise me to see Blizzard cave in to those forum whiners.