Modern Horizons 3 has a bonus sheet full of these, and two were shown off at MagicCon Chicago: Laelia, the Blade Reforged and Priest of Titania
So the first thing we have is demand driven by a card's functional value , tied to its relevance in the meta and its versatility in fitting into multiple decks or formats
You can then not only look at them whenever you want, but also play them as long as they remain exiled
The rest of OTJ's red uncommons While Demonic Ruckus can be a fine playable in aggressive decks, I tend to dislike Auras by nature
The need to release e-Card sets before Wizards license expired in 2003 was another factor
12 Quintorius, Loremaster Read Up On A Winning Strategy A creature generator and pseudo-card draw, Quintorius, Loremaster is a strange commander that gives you lots of value over the course of the game