Dimir Tempo fights on cantrips and free counters, so Consign to Memory is excellent against their Mishra's Bauble and any colorless spells while also eating triggered abilities like Kaito's -2 or Orcish Bowmasters' trigger. Force of Negation adds a second layer of free protection/disruption that can strip their Thoughtseize, Ponder, or a key enchantment-free spell on their turn. Prismatic Ending comes out somewhat since their nonland permanents (Nethergoyf, Moonshadow, Bilbo) are often better handled by Swords to Plowshares already in the mainboard, and Flow State is a weaker cantrip against a deck full of efficient discard and removal that punishes slow draws. Keep the core Brainstorm/Ponder/Force of Will package intact since the mirror-ish grindy matchup rewards card quality and free interaction.