Izzet Spellementals wants to untap with Hearth Elemental and Eddymurk Crab online while chaining cheap cantrips, so we need efficient ways to peel their threats off the board before they snowball. Sheltered by Ghosts exiles a nonland permanent on entry while sticking a lifelink/ward buff on one of our aggressive creatures, giving us both interaction and a clock. The extra Erode is cheap, unconditional removal for Hearth Elemental or Eddymurk Crab that doesn't care about their size. Twinmaw Stormbrood and a couple copies of Multiversal Passage come out since they're slower pieces that don't pressure the opponent's clock as hard as the proactive aggro plan we want here.

UR Aggro is a straight race deck built around Slickshot Show-Off growing out of removal range and Burst Lightning picking off our small threats, so this matchup is about winning the tempo war quickly. Sheltered by Ghosts answers their key early threat while giving one of our attackers ward 2 and lifelink to dodge their burn and stabilize our life total. The extra Erode is clean, cheap removal for Slickshot Show-Off or Elusive Otter before they get out of hand. We trim Twinmaw Stormbrood and a Lorehold since they're too slow against a deck that wants to close games fast.

Dimir Midrange relies heavily on recursive value from Enduring Curiosity, Requiting Hex, and graveyard-adjacent engines like Kaito and Floodpits Drowner, so Rest in Peace is excellent at shutting off their best grindy lines and exiling their graveyards outright. Doorkeeper Thrull is a flash flying blocker that also mutes their enters-the-battlefield triggers like Dream Beavers' drain and Floodpits Drowner's stun, buying tempo against their removal-heavy draws. We cut the top-end dragons (Twinmaw Stormbrood, Smaug, one Lorehold) since they're slow against a deck full of cheap, efficient removal like Bitter Triumph and Requiting Hex.