Black-Red needs early enablers
They let you get an additional copy of the best creature you control, something thats not really supposed to happen in a singleton format
5/5 Legendary Creature - Elemental Landfall -- Whenever a land enters the battlefield under your control, put a 5/5 red and green Elemental creature token onto the battlefield
Why would anybody use that as a metric for determining the value of their cards when low and median exist as options
If you're interested in Vintage, I highly suggest taking the time to watch his detailed video: The archetypes Gennari breaks down often revolve around one or two key cards, and are as follows: Mishra's Workshop Bazaar of Baghdad Blue Control Combo(non-Tinker) Deathrite Shaman Aggro Oath of Druids Blue Tinker Combo Other various archetypes "The line kind of blurs in the way we categorize the decks," Gennari says, noting that some decks can fit into multiple categories depending on specific card choices
According to Wizards of the Coast, the Gauntlet Soul Stone and Costume Change cards only appear in less than 1% of Collector Boosters