Although dragons are expensive, this one shines with changelings, especially the cheap ones like Changeling Outcast, or really cheap dragons like Slumbering Dragon
Then we get straight into cards that are rigidly symetrical and there's a lot of these, not just the afforementioned Horn of Greed: Font of Mythos, Howling Mine, Rites of Flourishing, Temple Bell and Well of Knowledge are all either directly beneficial to your opponents or allow your opponents to choose to get them, none have the benefit of being abusable with the possible excpetion of Well of Knowledge
Masterpiece Series cards were exceptionally rare, so the supply of them has always been low, and they dont sell often
On the other hand, the article also briefly mentions that Magic can be highly addictive, leading to parents worried about their children's Magic obsession
even a finely balanced game will have at least one card that sits above the rest