Jeskai Artifacts is an artifact-centric combo/value deck built around Urza's Saga, Goblin Welder, and Goblin Engineer, and much of its mana and engine (Mox Opal, Lotus Petal, the Baubles, Sewer-veillance Cam, Skateboard, Legion Extruder) is made of artifacts. That makes Pulverize the key card in this matchup. It destroys all artifacts, a huge blow to their deck, although their creatures such as Goblin Welder, Goblin Engineer, Emry and Loki survive. It also hits your own Lotus Petal, Lion's Eye Diamond, Mox Opal and Chrome Mox, so time it carefully, ideally after your own artifacts are spent or when you're not relying on them that turn. Once it's in your deck you can find it with Gamble or Beseech the Mirror, or simply hardcast it. Hexing Squelcher comes out to make room, since their creatures aren't individually must-answer threats; prioritize disrupting their engine over racing it.