If you use this for mana you are a card down and you no longer have an artifact in play
Not only can it wipe out aggressive early boards and most mana rocks, but it also gives you color-filtered mana for doing so, effectively making the card free, or a ramp piece, in many situations
Dropping any of the moxes turn one with maybe a sol ring and a signet, then you are basically winning out of the gates
Some can be a little hit or miss but its almost impossible to not find at least some of them either funny or endearing
Confirm set name, set code, release date, shrink/seal language, box condition, seller credibility, shipping method, and whether the price still makes sense after all fees