Flashfreeze cleanly counters their red spells, including the blue-red Prismari Charm, plus Burst Lightning and Hearth Elemental. It cannot hit the mono-blue Eddymurk Crab or Sunderflock, so those need to be answered another way. Torpor Orb shuts off Eddymurk Crab's tap trigger and any other ETB value, slowing their engine significantly. Shoot the Sheriff can hit their creatures (Hearth Elemental, Eddymurk Crab and Sunderflock are all non-outlaw), but their creature count is low and the matchup is more about fighting the engine than trading one-for-one with a creature, so we trim it for proactive disruption. We Say Thee Nay! is a soft tax effect that doesn't reliably stop their cheap cantrips, so we cut copies for more impactful hate pieces.

Flashfreeze is solid against this blue-red aggro deck for two mana, since it counters their red spells such as Burst Lightning, Slickshot Show-Off, Impractical Joke, and Vibrant Outburst. It can't touch their mono-blue spells like Flow State, so we save it for the red threats and burn. Vren, the Relentless exiles their creatures instead of letting them die, denying any graveyard recursion and building a Rat army to stabilize the board. Bitter Triumph makes us discard a card or pay 3 life, which is a real cost against an aggressive clock, so we make room for other interaction instead. We Say Thee Nay! is a soft counter that a low-curve aggro deck can often pay through, so we trim it for harder answers.

This is the mirror, so Duress proactively strips their key noncreature spells like Kaito, their removal, and their counterspells before they can use them. It can't take creatures like Enduring Curiosity, so treat it as a way to clear the path for your own threats. Day of Black Sun answers their small creatures like Dream Beavers, Floodpits Drowner, and Spyglass Siren, and it spares your own bigger threats if cast at a low X (it hits your own creatures at or below X too). Shoot the Sheriff is clunky since it can't hit outlaws like Azure Beastbinder and Spyglass Siren, and Kaito is only a hexproof creature during his controller's turn, so it rarely has a good target. We trim it. We Say Thee Nay! is a soft counter that doesn't close games in the mirror as well as proactive disruption and a sweeper.