WUBG's listed deck contains no blue spells or permanents, so Pyroblast and Red Elemental Blast (which only hit blue) have no legal targets and stay in the sideboard. Their plan is land destruction from Winter's Grasp and Thermokarst, plus Oath of Druids, backed by Sphere of Resistance taxing your spells and Terravore as a late threat. Your low curve of one-mana burn spells is already well-positioned against Sphere of Resistance's tax, so no sideboard changes are needed. Mox Diamond is a noncreature artifact, so your burn can't hit it. Instead, save Shock and Lightning Bolt for their creatures: Shock can kill an animated Mishra's Factory (a 2/2), and Lightning Bolt can kill an animated Treetop Village (a 3/3) or an early Terravore. Race before Terravore grows large.