Belcher is a pure combo deck trying to resolve Goblin Charbelcher or Lotus Bloom into a lethal activation, so maximum countermagic density is the priority over any pressure-focused cards. Consign to Memory's Replicate lets you counter multiple colorless spells like Goblin Charbelcher or Lotus Bloom in the same turn, which is exactly what this matchup demands, and it also stops triggered abilities like Hydroelectric Specimen's retarget trigger. Spell Snare picks off their two-mana-value pieces like Counterspell or Jwari Disruption. Mutagenic Growth and Violent Urge do nothing against a deck that ignores combat entirely, so replace them fully with interaction that can stop the kill.