Jeremy didnt like this but I think he was like 11 at the time and none of us knew the rules
In playtesting, I found I had a hard time getting face-down creatures to the board reliably often
I wouldnt say its useless in Constructed play, but I dont really see it being anyones first choice unless youre specifically building around adventure cards
They keep your cards safe and ensure you get the best grade you can
Anything with the ability to improve consistency and set up players for a counter when going second is good, but if your opponent has built up quite the impenetrable field with nine or more cards on their field when excavating from the deck, your opponent must shuffle their entire field and Graveyard in the End Phase
My english booster box has pack prices printed on it but it only has scandinavian currencies mentioned so my guess is that either they made different booster boxes in different marketing areas or the english cards were only sold in scandinavia and other languages in their respective countries, but that would leave also UK out of the places where it was published which would sound odd to me