I don't feel like the main deck needs any substitutions, but if you want to change the market I've put some alternatives in the sideboard. I removed Martyr's Chains because I never found a good opportunity to play it in this deck, and replaced it with Counting Room as an answer to void shenanigans that can also help keep our relic weapons alive longer.
(Updated) Removed Glorious Mistral and added Barbarian Guerrillas for more tools against relic decks.
Just out of interest, why did you not include Reforge? It provided me with quite a few wins, especially when getting Ossuar Longbow back.