BRG floods the board with cheap creatures (Callous Inspector, Gene Pollinator, Rottenmouth Viper, Mutagen Man tokens), so Day of Black Sun sweeps their early game while dodging our own bigger threats at low X. Preacher of the Schism is a resilient deathtouch blocker that also generates card advantage against their go-wide plan. Stock Up is too slow when we need to stabilize the board, and Archenemy's Charm's triple-black cost makes it clunky against a deck with too many small bodies to one-for-one profitably.

Flashfreeze cleanly counters key red spells like Hearth Elemental, Prismari Charm, and Traumatic Critique. Duress is weak here since their key spells are cast at instant speed or held up with mana, giving little window to strip them proactively. The extra Emeritus of Ideation adds a resilient flying body that outclasses their Elementals in combat and refills our hand in a grindy matchup.

Mono-Green Landfall wants to resolve one big threat like Mossborn Hydra or Mightform Harmonizer and snowball it, so Strategic Betrayal answers their best creature outright while also exiling their graveyard to stop recursive land value. Malcolm is an efficient evasive clock that races their ramp-heavy, removal-light deck. Stock Up is too slow against their proactive curve, and Archenemy's Charm's triple-black cost is clunky when we need cheap, efficient interaction.