This is a blue-black mirror-adjacent matchup where card quality and efficient countermagic matter most; Annul is a cheap way to counter artifact spells, though their deck has few artifact targets, so its main value is flexibility as a 1-mana answer if they bring in artifact-based sideboard cards. Essence Flare and the Blast effects are not useful here since Gro-A-Tog isn't red and their only real artifact/enchantment presence is minimal, so they stay in the sideboard. Flash of Insight's card selection is too slow in a counterspell-dense mirror where tempo and mana efficiency matter more, so trim it for Annul's flexibility. Protect the Dreadnought and race, since their Psychatog requires significant graveyard investment to become a serious threat, giving our early 12/12 the edge if unanswered.