We've always known they're there, but rarely do we get a glimpse behind the curtain of R&D at Wizards of the Coast to learn about them: the mistakes of the past. The skeletons in the closet, if you will.
But occasionally we do get a peek, and today Sam Stoddard was kind enough to give us that opportunity. In this article where he gives us the behind-the-scenes look we get a chance to see the history of format-altering cards like Stoneforge Mystic and Jace, the Mind Sculptor.
It's an interesting read and well worth it. You can find the full article here.