It’s not just the heavy opening, but it’s also that you have a small set of cards with high price tags. An in print set can only hold so much value, and having cards that just maintain value as other cards are opened and sold off causes the rest of the stuff to be worth less on average than in other sets.

So, is the expedition effect just the concept that a set is opened heavily because it contains staples, or does it mean something else?

Maybe so, but it’s hard to define it exactly. If Sylvan Advocate is from Oath and it is definitely being suppressed by the Expedition effect. It’s in like every deck and it’s barely over $5!

You are so very right. Still like the pick though.