Well, me, to be honest.
I was cleaning and reorganizing my bookshelf/computer desk, and came across a long-forgotten folder of stuff. In that, there was a small collection of MtG ideas.
I forgot that during the early ’00s I created a huge assortment of ideas, including some mechanics. Like Winding, which needed the colorless equivalent of the casting cost to untap. This was also the time when I had an interest of clockwork, and a huge chunk of the ideas included it.
Of course, some were simply chaotically broken.
The majority of these cards were already published the original Geocities website that I had during that time, and I thought that they were destroyed when they shut their doors. Not anymore! 😀