Card has seemingly disappeared?

I pulled the Invincible legendary in one of the free march of the lich king packs I got and was ecstatic to see it incorporated in a very good Rogue build a week later. Copy the deck code paste it in Hearthstone but noticed Invincible is now showing as a missing card?

I definitely pulled it and would certainly not disenchant arguably one of the strongest cards this expansion. It makes no sense to me, support hasn’t responded in 5 days now but after reading the forums I can see this is the norm these days, which is unfortunate to see.

I would normally not kick up a fuss, but I’m a recently returned player after a 5 year hiatus and only have one free deck to play with, and I’ve logged over 300 games with it since my return in November. It has gotten stale.

I was excited to try this new deck as I only needed a few epic’s and rares to complete it but I’m just left sitting on my hands hoping support doesn’t give me generic response after 1-2 weeks of waiting. I don’t want to craft it using what little dust I have because I should ALREADY have it. Very frustrating when you only have one useable deck.

Apologies for my rant.

Missing several cards here and a friend I play with has the same issue (lost all her hero cards like Jaina and several others)