With Captain Baral's soldiers hot on your heels, you duck into an artifact foundry to hide. But as soon as you enter, a host of automated artifacts detect your presence and come to life. They don't look very friendly.
The Foundry Security runs a different kind of artifact creature deck than the opponent's deck in the previous mission, with only artifact creatures and lands in the deck. Be especially wary of the two artifact creatures that buff others, Steel Overseer and Chief of the Foundry; in particular, Steel Overseer can quickly get out of hand, permanently buffing all of the opposing creatures every turn unless it's dealt with.
Fortunately for Chandra, her deck got a powerful upgrade over her deck from the last mission with respect to this matchup, by adding three Manic Vandals, which destroy an artifact when they enter the battlefield; in this matchup, that means any of the opposing creatures. Use burn and Vandals to destroy the bigger threats (X/3s and larger, or Steel Overseer) and the duel should be fairly easy.