Mainboard (61)
Creatures (29)
Instants (4)
Enchantments (4)
Sideboard (15)
Dimir Tempo aims to disrupt your board development with Thoughtseize, Wasteland, and a clock of efficient threats like Murktide Regent and Nethergoyf backed by Force of Will and Daze. Pyroblast comes in as efficient disruption against their blue threats and countermagic — it can blow up Murktide Regent, counter Force of Will, and trade with Brainstorm all for a single red mana. Static Prison is too slow against a deck that answers permanents with Kaito's bounce ability and trades efficiently, and trimming a Hexing Squelcher reduces reliance on cards that need setup against a tempo deck that's constantly pressuring your mana. Prioritize resolving Thalia, Guardian of Thraben early as it significantly taxes their Daze, Force of Will, and Fatal Push, and lean on Swords to Plowshares to cleanly answer their threats without feeding Nethergoyf. Voice of Victory and Ocelot Pride generate resilient token pressure that demands answers they may not have enough of.
Oops, All Spells! is a turn-1 or turn-2 combo deck that wins by milling its entire library with Balustrade Spy or Undercity Informer, then using Dread Return to reanimate Thassa's Oracle for an immediate win. Leyline of the Void is your most powerful answer — a turn-0 Leyline shuts off Bridge from Below, Narcomoeba, and Agadeem's Awakening, gutting the combo's redundancy and speed. Containment Priest backs this up by preventing reanimation effects and blocking creatures entering from the graveyard, while also being a relevant body against their Pact of Negation-protected combo lines. Static Prison and Goblin Bombardment come out as they do nothing against a deck that can win before they're relevant and doesn't attack you in a way they answer. Keep Thalia, Guardian of Thraben in — taxing their Dark Ritual, Cabal Ritual, and Pact of Negation sequences by one mana can be the tempo hit that lets your hate pieces resolve in time.
Sneak and Show is a combo deck that wins by cheating Emrakul, the Aeons Torn or Atraxa, Grand Unifier into play via Sneak Attack or Show and Tell, so your priority is disrupting those two payoff spells. Gaddock Teeg is your best card in this matchup — it shuts off Show and Tell (CMC 4+) and Omniscience entirely, so getting it into play early is critical. Pyroblast counters or destroys key blue pieces like Brainstorm, Ponder, and most importantly Force of Will, which they use to protect their combo. Static Prison and Hexing Squelcher are too slow or situational against a pure combo deck that can win on turn 1-2, and Sand Scout provides minimal value when the opponent is not playing a creature-based game plan. Apply pressure with your aggressive creatures to close the game quickly before they can find their combo pieces.