Mono-Green Landfall wants to flood the board and pump creatures with Earthbender Ascension, Bristly Bill, and Mightform Harmonizer, so Flashfreeze is excellent since virtually their whole deck is green. Shore Up protects Hearth Elemental or Sunderflock from Meltstrider's Resolve fights and gives a surprise combat trick against their bigger threats. Annul counters key enchantments like Earthbender Ascension and Meltstrider's Resolve, providing a huge tempo swing against their engine. Spell Pierce is weak here since they aren't casting many crucial low-cost spells you need to stop, and Winternight Stories comes out because tapping three mana at sorcery speed is too slow while you're trying to survive their board development.

Dimir Midrange is grindy with high-value threats like Kaito, Bane of Nightmares and Elektra, so extra Spell Snare is great against their many two-mana pieces like Kaito's ninjutsu cost consideration aside, Floodpits Drowner, Bitter Triumph, and Nowhere to Run. Annul is mostly a sideboard tool here since their maindeck has few targets beyond Nowhere to Run and Enduring Curiosity, so skip Annul rather than bringing it in speculatively for opposing sideboard cards like Soul-Guide Lantern. Get Out is awkward since its counter mode misses planeswalkers like Kaito and its return mode only targets your own permanents, so trim it in favor of more efficient interaction. Prioritize Traumatic Critique and burn to close games before they stabilize with Enduring Curiosity or The Wondrous Wasp.

Dimir Excruciator leans on discard like Duress and Deceit alongside removal like Requiting Hex and Bitter Triumph, so the extra Spell Snare is strong against their many two-mana interaction and threats such as Bitter Triumph and Strategic Betrayal. Annul mainly answers their sideboarded artifacts, so hold it back unless you know they're bringing in cards like M.O.D.O.K.; otherwise it's a marginal inclusion. Get Out is weak since their maindeck has almost no enchantments and few early creatures worth countering, so cut it for more efficient interaction. Play around their discard by deploying threats in multiples and use Spell Pierce sparingly since they have ample mana to play around it by the time you need to stop Deadly Cover-Up or Stock Up.