Boros Moxite runs a heavy artifact package (Melded Moxite, Lembas, Ragged Short Spear, Glint Hawk, Kor Skyfisher's bounce targets, artifact lands like Ancient Den and Great Furnace), giving Steel Sabotage real value either countering a key artifact spell or bouncing a problematic Equipment. Blue Elemental Blast and Hydroblast have a few legitimate red targets (Lightning Bolt, Galvanic Blast) but the opponent's threats are mostly white creatures and artifacts, so Steel Sabotage is the higher-impact sideboard card here. Deem Inferior is replaced since it only delays one threat while this aggressive artifact-matters deck rebuilds quickly; prioritize countering their key Equipment or creatures with Counterspell and Dispel.