If your card is trending or has a story (recently pulled, first edition, etc.), a well-promoted eBay auction can attract bidding wars that push the price above what you'd get on a fixed-price platform
NICE POP OF COLOR IN MY KITCHEN5 Wish this wasn't being discontinuedJohnI love this blue/green runner
It has been around (and has been good), but I think it may be particularly well positioned given the push towards decks light on removal
Better yet, you can use Spikemuth [Destined Rivals] to proprietarily search for your Marnies Pokmon, which means were often just a Rare Candy [Scarlet and Violet] or Marnies Grimmsnarl ex away from getting out a big attack
It's really hard for me to predict--like most things nowadays, it'll depend on the speed of the format, the number of creature Sagas you include in your deck, and the gameplay itself