This is a mirror-ish matchup against another white aggro deck, so Dust to Dust comes in to exile their Clue tokens from Thraben/Novice Inspector and any other artifacts, slowing their card advantage engine. Clowning Around's small Robot tokens die too easily to their removal suite (Thraben Charm, Journey to Nowhere sideboard) and don't impact the race enough, so it comes out. Keep Dispatch and our full removal suite since tempo and efficient blocks matter most in this mirror. Prismatic Strands in their sideboard can blank a combat trick turn, so sequence Guardians' Pledge and Ramosian Rally carefully to bait or play around it.