High Noon is a powerful speed bump against their Devoted Druid/Vizier of Remedies infinite mana engine, since it limits them to one spell per turn and disrupts the multi-spell sequencing they need to combo off. Rest in Peace stops Agatha's Soul Cauldron from exiling creatures out of the graveyard productively and shuts down any Green Sun's Zenith-adjacent graveyard recursion. Teferi, Time Raveler is less impactful since their combo doesn't hinge on instant-speed interaction, so trim a couple copies. Keep Solitude and Galvanic Discharge in to kill Devoted Druid or Delighted Halfling on sight before they go off, and hold Consign to Memory for Walking Ballista or other colorless pieces.