Caw Gates is a grindy white-red aggro-midrange deck packing Journey to Nowhere and its own Prismatic Strands, so we want efficient removal and protection for our key threats. Thraben Charm deals damage equal to twice our creature count, easily killing their small creatures like Sacred Cat or Outlaw Medic, and can destroy enchantments like Journey to Nowhere or exile their graveyard to stop their flashback spells. Standard Bearer forces their targeted removal spells or activated abilities onto itself, shielding our real payoffs like Tireless Tribe or Aurora Eidolon. Sandstorm Eidolon is a weaker body against their small-creature strategy since it doesn't kill anything on its own, so it's the first cut alongside a Bitter Reunion, since card selection matters less than board control here.