Prismatic 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.