Mono-Green Eldrazi ramps hard off Eldrazi Temple and Ugin's Labyrinth to cast Emrakul and Ulamog well ahead of schedule, so Damping Sphere caps those lands at one mana each and meaningfully slows their ramp plan. The extra Lightning Bolt is useful early removal for Sowing Mycospawn or Dryad Arbor before they build board presence. Cut Burning Inquiry since it's not worth the card disadvantage risk here, and trim Practiced Offense since its creature buffs don't deal with their big colorless threats.