Boros Moxite has no blue cards, so both anti-blue Blasts have no legal targets and must stay in the sideboard; this card listing was likely included in error since they hit nothing here. Relic of Progenitus can exile their graveyard to deny any value from cards that care about it, though its impact is limited since their deck is mostly proactive aggro. We're already the faster deck with more efficient burn, so the main plan is simply to keep our clock intact; trim slower value pieces like Highway Robbery and extra Melded Moxite copies for more relevant answers only if needed. Given how few actual silver bullets we have, a very light plan is correct here.