Temur Lessons wants to chain Lessons and Firebending Lesson/Combustion Technique into a value engine culminating in Thor, God of Thunder, so cheap removal like Erode is efficient at answering Questing Druid or Thor before it snowballs. Rest in Peace denies any graveyard-based value they might generate and disrupts flashback-adjacent plans, while cutting off recursive value from their Lesson package lingering in the yard. The slower Aang, at the Crossroads and Michelangelo's Technique are less impactful here since the opponent is also grinding value, so prioritize efficient interaction to stay ahead on tempo and answer Thor before it starts pinging our board.