Updated the Topic to reflect on what's going on.
FAQ:
What are all the Iron Costumes and Accessories?
There's six total ranging from six tiers: Common, Uncommon, Rare, Extraordinary, Precious, and Unparalleled.
At the rate it's going, it seems as though it's 65% for Common, 27% for Uncommon, 6% for Rare, 2% for Extraordinary, 0.1% for Precious, and 0.01% for Unparalleled.
The Costumes and Accessories are:
Iron Wolf Helm: Common
Iron Wolf Armor: Uncommon
Iron Dragon Helm: Rare
Iron Dragon Armor: Precious
Iron Wolf Tail: Extraordinary
Iron Dragon Wings: Unparalleled
How exactly do I obtain these Iron Items?
The Iron Costume pieces and Accessories are part of Steam's 2013 Holiday Sale. Upon spending $10.00, Crafting a Badge, or Voting Three Times on the Community Choice, you will receive one out of ten Snow Globe Cards, once all ten cards have been collected, you will randomly receive one of the items out of ten Free-to-Play games, one of them being Spiral Knights.
The Armor may be purchased from the Market though if you'd prefer to do it that way.
So there's no catch? I can redeem the same one constantly and sell them?
There is one catch with the Iron Costumes and Accessories, they may only be redeemed once per steam account. So if you ever sell it or lose it, you may not purchase and redeem another one. However, all items come unbound.
I redeemed both the Iron Wolf Helm and Iron Wolf Coat but only got the Coat!
This is a bug, contact in-game support explaining the situation and they'll sort things out: https://www.spiralknights.com/support/#requests_new
Original post below:
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http://store.steampowered.com/promotion/snowglobefaq
>Iron Wolf Helm
>Iron Wolf Armor
>Iron Dragon Helm
>Iron Dragon Armor
Wat
How do you get them? That Wolver Cap actually looks sweet, as well as the Dragon Helm.