Ryan Miller (Senior Brand Manager) revealed the Golden Mickey cards are so rare that not even the development team owns one: they can only be won, and no secret ones will be given out - except for one special Golden Mickey card which will be given to the Lorcana World Champion
Its already proved too strong for Legacy
At that point in the game, there will be big targets on the board, and being able to remove them will be what you will need to do to win the game
Not only that, this card has a good amount of willpower and lore-generating capability too, since each quest gets you three lore, so it can tank some damage and still help you win the game.
Te K Elemental Terror When I first pulled a copy of this card, I was shocked at its stat-line and never-ending positives: The joint highest cost and clear highest Strength and Willpower of any character, it can shift for 7, it is inkable, it has an inkable shift target AND a useful ability
Getting cards back from the bin for free is always a good prospect, and you just need to add Tortured Existence to really get your moneys worth