Jeskai Artifacts goes wide with cheap creatures like Emry, Lurker of the Loch and artifact creatures like Pinnacle Emissary while using Goblin Welder and Goblin Engineer to recur value, so removal that kills their key engine pieces is better than sorcery-speed discard. Bitter Triumph can kill Emry, Lurker of the Loch or Loki, God of Mischief at instant speed, denying them a key recursion or card-advantage piece before they can use it. Keep Thoughtseize and Unmask in since stripping Goblin Welder or a key artifact from their hand before it hits the board is still very strong against this low-curve, proactive deck. This matchup comes down to our deck's raw power level outclassing their small creatures, so don't overboard — just upgrade a weak sorcery-speed discard spell into removal.