There are expensive commons with unexplained value
take on a solid drain trigger and you get one of blacks best aristocrat commanders: Sephiroth, Fabled SOLDIER
Cards with prepare are creatures first, but they also come with a built-in spell attached
Because it shows us which cards the dealers felt were going to be the most important going forward by having their buylists reflect that confidence all at once (due to the massive influx of tons of people opening expensive cards and wanting to offload them)
Being able to take an extra turn for merely two mana is so wildly overpowered that, along with Chaos Orb and a few others, Time Walk became one of Magic's earliest banned cards
The three-drop enchantment in your upkeep will toss a couple of counters here and then mill that many, then if you would draw from an empty library, you instead will get a free Zombify