What is the legendary card you crafted and regretted shortly after?

What is the legendary card you crafted and regretted shortly after?

Bonelord Frostwhisper. I love OTK decks I thought it was an autoinclude but it has never found use in any meta.

Mutanus the devourer. Crafted a few weeks before it rotated from the standard, not knowing it. Played a maximum of two or three times.

Invincible. I really liked the rougue deathrattle undead deck however the deck was nerfed shortly after taking it out of the meta, I played it for a week at most.