Damping Sphere is strong since it caps Eldrazi Temple and Ugin's Labyrinth at one mana per tap, slowing the big-mana backup plan and making it harder to chain Urza's Saga constructs and activations in one turn. Celestial Purge is mostly dead here since their colors are green and colorless (devoid cards like Basking Broodscale and Sowing Mycospawn aren't red or black), so it should be left in the board; replace that plan: instead keep removal focused on Galvanic Discharge and Thraben Charm to kill Basking Broodscale or Blade of the Bloodchief's equipped creature before the loop goes off. Static Prison and The Legend of Roku are the weakest mainboard cards against this low-curve combo deck since we need to be proactive and cheap rather than slow, so they make way for Damping Sphere and an extra piece of interaction. Prioritize removing Blade of the Bloodchief's equip target or Basking Broodscale on sight to deny the infinite loop.