Given that the most desirable copies of these cards are typically graded, it's difficult to give an accurate representation of their desirability by only considering their raw values
You only need 14 noncreature, nonlands in your graveyard for Isengard Unleashed to wipe out the rest of the table
They protect your unsleeved cards from being scratched up in the deckbuilding phase, and they make it SO much easier to pick up individual cards instead of sliding them to the edge of the table
I really have no idea, because there isn't a high demand for these guys
A rare MP copy dropped as low as $50, which would be a nice saving if you can find another and don't mind the condition
Overall its a solid precon to sit down with, partly due to Olivias straightforward value-based approach to a win condition, but the reprints are a little less exciting for veteran players