In the US, department store Target stopped selling the cards saying it needed to protect its staff from fans (and scalpers) desperate to snap up whatever crumbs of stock were available
This next banning will occur on November 24th, 2025
On top of giving near immunity to counters, red and black have a ton of creature and artifact removal effects, and with Shadow giving them split second, you can get around most tricks that other colors can use to protect their permanents
First and foremost, Stoneforge Mystic is in Modern, and Stoneforge Mystic decks will be able to run it as a one-of, hope it hangs out undrawn in their library in matchups where it is bad but find it consistently with Stoneforge Mystic in matchups where it is good
True value comes from a combination of rarity, demand, condition, and cultural significance
These are currently quite expensive for their young age, and will likely become a sought after promo card in the future