Most of these things are at least thirty years old and require forgers to get thousands of tiny details exactly right
With Sheoldred, the Apocalypse, there is both the showcase treatment and a Phyrexian version
Given the best manabases for prEDH would use OG Duals, Fetchlands, and Shocklands, not having easy access to one (or more) of them puts non-legacy players in the rough spot of relying on prEDH's limited and patchy color-fixing options which can leave new decks performing at a more clunky pace than they otherwise would be if built back in New Phyrexia
Extended Art Extended art returns on cards in Collector Boosters and 13 new-to- Magic cards in each Collector's Edition Commander deck
These are usually cool and fun ways to get into the format
Similarly, the infamous Thoughtseize, one of the game's best hand control cards, ranges from $15 to $25 for most versions