This is the mirror, so tempo and threat density matter more than card selection — Colorstorm Stallion is a fast clock that grows every time you cast an instant or sorcery spell, and it survives the ground stall better than pure cantrips. Annul stops their Ghost Vacuum and any artifact-based hate, while the extra Spell Snare cleanly counters their cheap two-mana spells like Get Out and Prismari Charm. Cutting Sleight of Hand thins redundant card selection since both decks are already flooded with cantrips, and trimming Multiversal Passage to keep the manabase lean while adding real action is worth it since you already run 19 other lands. Prioritize resolving your own threats and using Prismari Charm to answer their Hearth Elemental and Eddymurk Crab before they snowball with Sunderflock.

Mono-Green Landfall wants to flood the board with mana dorks and landfall payoffs like Mightform Harmonizer and Mossborn Hydra, so you need to race and pressure rather than sit back trading cards. Colorstorm Stallion provides a fast, resilient clock that also blocks well against their small creatures, while Ral, Crackling Wit generates card advantage and Otter tokens to help stabilize against their wide boards. Spell Pierce is weak here since they can easily play around it or simply have the extra mana by the time you need it, and Flow State is too slow against a proactive deck. Keep your removal package (Burst Lightning, Prismari Charm, Get Out) intact since it answers their key threats like Bristly Bill and Icetill Explorer.

Dimir Midrange plays a grindy value game with Kaito, Bane of Nightmares, Enduring Curiosity, and Requiting Hex, so Disdainful Stroke is well positioned against their many four-plus mana value spells like Kaito and Elektra, Daughter of the Hand. Impractical Joke is often too small to matter against their resilient threats and is better cut for more proactive interaction. Spell Pierce is unreliable in the mid-to-late game once they have mana up, but Annul is mostly a sideboard hedge here since they run few artifacts or enchantments — consider it a low-impact inclusion mainly against Nowhere to Run or Enduring Curiosity if needed, otherwise lean on your removal suite. Use Prismari Charm and Burst Lightning to keep their small creatures like Spyglass Siren and Floodpits Drowner off the board.