Good morning all,
As you know, to see a unique building in the Magic Academy recipes, it must not be in your inventory or placed in your city.
Do also keep in mind that all of the buildings that use artifacts to evolve can be deleted, but the artifacts are deleted with them, and although you may build another in the magic academy when and if it is available again, it will be level 1.
As far as I know, the Gingerbread base is not out of rotation but it may take a while to show, as we rotate many different evolving buildings. In any case, I will forward your feedback on how much this particular building is appreciated.
Have a magical day!