Dimir Tempo leans heavily on blue cantrips (Ponder, Brainstorm) and Daze/Force of Will, but Hydroblast only counters a spell or destroys a permanent if it's red, so while it can legally target any spell or permanent, it has no effect in this matchup since their list has no red cards (their sideboard Blue Elemental Blast is blue, not red, and Dauthi Voidwalker is black). Deafening Silence slows their disruption-heavy plan by capping them to one noncreature spell a turn, disrupting their Thoughtseize into cantrip sequencing. Stifle is weak here since they have few relevant triggered/activated abilities to target, and Erode is redundant with Swords to Plowshares against their light creature suite. Keep Force of Negation and Force of Will at full count since protecting your own threats from their Daze and Force of Will is critical.