Izzet Spellementals chains cheap cantrips like Opt and Sleight of Hand, making Magebane Lizard punish every extra noncreature spell they cast per turn while blocking their early creatures. Strategic Betrayal is a clean exile answer to a growing Hearth Elemental or Eddymurk Crab that also strips their graveyard resources. Requiting Hex only kills mana value 2 or less, missing their real threats, so it comes out. Case of the Crimson Pulse helps refill after their card selection outpaces you, giving you a comparable card-advantage engine.

UR Aggro fires off a high volume of cheap cantrips and burn (Opt, Sleight of Hand, Burst Lightning) to fuel Slickshot Show-Off, so Magebane Lizard punishes every extra noncreature spell they cast each turn while blocking their small fliers and ground creatures well. Dawn's Truce protects our board and life total from their burn suite (Burst Lightning) and bounce (Into the Flood Maw) at instant speed during a critical turn. Requiting Hex is serviceable but redundant given how many of their threats are mana value 2 or less already covered by our removal suite, so we trim it alongside Practiced Offense, which is too slow against this tempo-oriented plan.

Dimir Midrange leans on planeswalkers like Kaito, Bane of Nightmares and card-advantage enchantments like Enduring Curiosity, so Duress strips Kaito or their countermagic (We Say Thee Nay!, Spell Pierce) before they land. Strategic Betrayal is a clean exile answer to a resolved Floodpits Drowner while also clearing their graveyard. Their own maindeck Requiting Hex only hits mana value 2 or less, and our higher curve (Casey Jones, Vigilante; Carnage, Crimson Chaos) dodges that, so we keep our curve intact and just add proactive disruption while trimming redundant removal that overlaps with our own Requiting Hex copies.