Their scarcity and artistic appeal significantly drive their market value, appealing to a broad segment of the collector community
There are now different kinds of cards split similar to these, and some of the rules have changed since the original question was asked
In the absence of cards like [casthaven]Stifle[/casthaven], [casthaven]Wasteland[/casthaven], [casthaven]Force of Will[/casthaven], and dedicated hosers, I have no idea how Modern decks can fight them, other than by playing a version of Eldrazi designed to break the mirror (or perhaps [casthaven]Painters Servant[/casthaven] is a stronger hoser than it appears)
Commander Qty: 1 Price: $3.99 Minsc & Boo, Timeless Heroes When Minsc & Boo enters and at the beginning of your upkeep, you may create Boo, a legendary 1/1 red Hamster creature token with trample and haste
Sableye #291 (Pokemon Japanese Shiny Treasure ex | Pokemon Cards) prices are based on the historic sales
Black Star Ishihara Signed GX Promo Card $247,230 (Sold: April 2021) This card features Pokmon Company founder Tsunekazu Ishihara and was given to company staff to mark the man's 60th birthday in 2017