Boros Moxite is an artifact-heavy aggro deck with Melded Moxite, Ragged Short Spear, Lembas, and a mostly artifact-land manabase (Ancient Den, Great Furnace, Rustvale Bridge), so Dust to Dust is a premium two-for-one against their permanents, though note the Bridges are indestructible but not protected from exile. Holy Light's -1/-1 is mostly dead on their white creatures like Glint Hawk and Kor Skyfisher since it only hits nonwhite creatures, so it's a lower-impact include. Its clean target is Sneaky Snacker (a 2/1), which dies to it. It only shrinks a Robot token from Melded Moxite (a 2/2) to 1/1 until end of turn, so it won't kill one on its own and is only useful there alongside combat damage or another effect. Idyllic Grange's tapped-land downside is too costly against another aggressive deck, and Guardians' Pledge/Prismatic Strands are less impactful than proactively stripping their artifact-based equipment and artifact lands. This mirror comes down to curve and removal efficiency, so prioritize Dust to Dust highly.