A 1996 Ultra Home Run Kings Gold Medallion was found one per every 750 packs (one per 7500 packs to get your player), which always blew my mind until I looked deeper into the odds from 2024 Topps Chrome: https://www.topps.com/media/pdf/odds/2024ToppsChromeBaseballOddsv2.pdf
Damn there are a lot of cards produced and I’m glad I buy singles!