Since the DLC: Taken King is out, Eva sold all the rare emblems she had, and that, many times for each, except the Winterborn Mark. It's the emblem I'm missing in my collection of emblems coming from Eva Levante. I come everyday on Destiny just to see if she is selling this one, yet, it's never there. I don't understand why would this one not be sold yet the other ones have been in shop 3 or 4 times. They all have the same "rare" value, which mean they should all have the same chances to be sold.
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I've purchased Winterborn from her numerous times. She definitely sells it.