Temur Lessons leans on Questing Druid and Thor, God of Thunder as its biggest bodies while chaining Lesson cards for value, so Scorching Shot gives you an answer that actually kills Thor's 5/5 body instead of just chipping at it, while Sear offers reliable high-damage removal. Both are also fine against a Questing Druid if it goes unchecked. Cut Channeled Dragonfire and Shock since 2 damage struggles against their larger threats like Thor, and this matchup instead comes down to racing before Tablet of Discovery and Accumulate Wisdom generate too much card advantage.