The insane utility of getting a free 2/2 flyer out of any dinky little food- or clue- or treasure-making effect will ensure this card becomes a valuable chase rare for years to come
You can usually tell these from the two gold overlapping quarter circles, or from the additional information on it for example, there were cards released at D23, Disneys annual conference, which contain a D23 logo instead
If you played the TCG in the late '90s or early 2000s, you almost certainly had a Scyther in one of your decks, and that kind of personal connection drives prices in a way that pure aesthetics can't always replicate
Looking at many of the old creatures on this list, it's hard for new players to know what they are missing, because in the context of today's creatures they generally aren't missing all that much
Not having to worry about interactions in fair game states is incredibly useful too