Or, more likely, people simply love Haunter and want to grab the only rare version of the card hence the high price point
However, the video game does not have this rule at all, and personally I don't use it either
They'll cast powerful spells, call upon classic sum
$0.99 Commodore Guff (Foil Etched Display Commander - Not Tournament Legal) Commander Masters Variants $2.49 Teferi, Timebender (Foil - Planeswalker Deck) Dominaria $6.49 Teferi, Who Slows the Sunset (Borderless) Innistrad: Midnight Hunt Variants $3.99 Vronos, Masked Inquisitor Commander Masters $9.49 Narset Transcendent Dragons of Tarkir $0.79 Oath of Teferi Dominaria $0.99 Contentious Plan War of the Spark $0.79 Oath of Teferi Commander Masters $2.99 Elspeth, Sun's Champion (0097 - Borderless) Bloomburrow Commander Decks Variants $3.49 Flux Channeler War of the Spark $8.99 Ichormoon Gauntlet Phyrexia: All Will Be One $0.79 Teferi's Talent Emblem March of the Machine Commander Decks 0 results found
This has great synergy with a few styles of builds, and is castable with the mass Treasures it makes
Black Lotus Black Lotus is arguably the best Magic card of all time and the most expensive, next to the one-of-a-kind The One Ring