I presume it makes creature cards in your deck into artifact creatures so that you can potentially search them out with something like Kuldotha Forgemaster or Magda, Brazen Outlaw
Today lets take a look at black removal spells
Crew 2 Legendary Artifact - Vehicle Artifact (CTRL to add secondary) Creature Banon, the Returners' Leader Pray Once during each of your turns, you may cast a creature spell from among cards in your graveyard that were put there from anywhere other than the battlefield this turn
Zone or 99: Zone Witch-king of Angmar That is one heck of an attack deterrent
Sideboards are important in best-of-one (BO1) and best-of-three (BO3) formats, but mostly in BO3
Cheaper acquisition plus globally-set resale value is, of course, the entire logic of arbitrage and it is why so much of our volume goes to repeat overseas buyers, including card shops and resellers