Mystery monster: Yuandan

This doesn't seem to appear for anyone else. Maybe another iOS problem. There's a "ghost item" in my shop that cannot be bought. Tapping the other scrolls would say "not enough items" but tapping this would say "item doesn't exist". It shouldn't have been in the shop but it is, unavailable for purchase. I'm not complaining. I just find it interesting. I have attached the pic of this monster below. Yuandan "NewYear" possibly the final me ever to the legendary dragons gang.

Interestign, i wonder if thats the new token mob coming january 2018, hence the name "NewYear" and its new localized name as Yuandan