As I mentioned before, the most powerful way to build Commander decks with MDFCs is to cut five or six lands (usually basic lands or other utility lands that tap for one color of mana) along with two or three spells and replace them with MDFCs so that you end up with something like 31 or 32 "real" lands but 40 or 41 total lands
Being able to target any sort of permanent is already great when you consider the power of Oko, Wrenn, Narset and Breach
No intentional two-card infinite combos or mass land denial
Before that, some cards would get alternate promo art, or alternate art in reprints, but it was sparse and not particularly interesting
Innistrad is one of Magic: The Gatherings most popular planes for a reason, seeing multiple sets packed full of powerful, suitably spooky designs
If it's a lot more than that, you're probably looking at a listing from a third-party seller, and not a retail price