What's your rarest card?

Like:

What would you say is the rarest card in your collection. (metric: The least players own it)

For me it's most likely Golden Captain's Parrot. :D

There are so many bad legendaries I still have golden ones off, but I think the Parrot can't be earned anymore (I wish I had ETC or Gelbin :/)

IFF it should be atainable again it's most likely golden Sherazin, Corpse Flower or golden Zerek, Master Cloner

I believe Golden Gelbin Mekkatorque is mine. Captain's Parrot or Old Murk-Eye would also be pretty rare (because they also can't be earned anymore) but neither of those two is golden for me like Gelbin