Affinity floods the board with small artifact creatures like Kor Skyfisher, Glint Hawk, and Refurbished Familiar, so Thraben Charm's damage scales well with your own creature count and can two-for-one their threats; it can also exile artifacts off the top via its graveyard-exile mode is irrelevant here, but its main damage mode is the real draw. Standard Bearer redirects their removal (Dispatch) and Galvanic Blast away from your key threats. Obsidian Acolyte doesn't block their colorless/white threats especially well but still trades up against Baleful Strix and dodges nothing relevant here, so consider it a passable 1/1 body; the real value is in the Charm and Bearer. Sandstorm Eidolon and Fling are cut since removing blockers or going for a burst finish is weak against a wide, resilient board of cheap artifact creatures.