Well, Bazaar of Baghdad is exactly that, and still ends up being a wildly overpowered card , especially for mid-to-late game situations that may require heavy card draw, searching your deck for your game winners, and interaction with your graveyard
But to answer the question, and maybe its a bit cheesy, but I think the most surprising reaction Ive seen is just how much players appreciate the little details of the series included, truly validating the effort the various teams put into the set
Primal Groudon EX Shiny Full Art from Ancient Origins, while up from its January level, has started to plateau compared to the true megastars of the format
I tried out a fairer Esper build in my Ten New Brews from last week, but the fair gameplan just wasn't robust enough to be relevant
Sticking Jenson Carthalion in the Command Zone (or even Golos or Ramos) will help make up the gap, but probably not completely