This little artifact is only an uncommon card, but the potential power level is unbelievably high. Damping Sphere will definitely soar in price after the release due to its ability to counter two of the most powerful decks in Modern: Tron and Storm.
The fact that it's colorless makes it viable in every single deck. You will see all four copies of Damping Sphere in each sideboard. Even Legacy players will have it against decks that run Mishra's Workshop.
All in all, the current price is a bit of a joke because many people still don't believe that a card so strong could exist. But it will go up without a doubt!