Missing sideboard cards? The full 15-card sideboard runs about $123.
Buy sideboard on ManapoolPrismatic Ending can exile Ocelot Pride, Guide of Souls, or Ajani, Nacatl Pariah cheaply, stopping the token engine before it snowballs. Doorkeeper Thrull is a flash flyer whose static ability stops abilities from triggering whenever artifacts and creatures enter, for as long as it stays on the battlefield. That shuts off Guide of Souls' life gain and energy trigger, Ajani's enter trigger that makes a Cat Warrior token, and Amped Raptor's enter trigger. It does not stop Ocelot Pride's end-step token creation, so Prismatic Ending is the answer to that card. Thrull also turns off our own creature enter triggers, such as Badgermole Cub's. We trim slower, noninteractive green creatures since this matchup rewards cheap, flexible answers over incremental card advantage.
Consign to Memory counters triggered abilities and colorless spells, giving a cheap answer to Orcish Bowmasters triggers, Bilbo's attack trigger, and colorless spells like Mishra's Bauble. It cannot hit their blue or black spells. Lavinia stops them from casting noncreature spells with mana value greater than the number of lands they control, which keeps Kaito off the table early. It also counters any spell cast without spending mana, like a free Force of Will or Daze. Endurance can be evoked for free to strip their graveyard, cutting off Nethergoyf's size and escape, and Bilbo's ability to recast spells from the graveyard. We trim slow value creatures that don't interact with their disruptive tempo plan.
Consign to Memory is cheap, flash interaction that answers colorless spells and triggered abilities without needing to beat their protective countermagic. Doorkeeper Thrull is a cheap flash flyer that can pressure them and block, playing around Daze since it's inexpensive to recast. We trim slow value creatures since this matchup is about disruption and racing their setup turn, not grinding card advantage.