Every spell this opponent casts is red, so all 4 Blue Elemental Blast come in as live, mana-efficient answers to Lightning Bolt, Fiery Temper, Fireblast, Guttersnipe, and Kessig Flamebreather. Last Breath exiles Guttersnipe or Kessig Flamebreather to shut off their damage-per-spell engines before they snowball. Keep Prohibit in, since it counters most of their cheap spells and creatures (Lightning Bolt, Fiery Temper, Lava Dart, Faithless Looting), and trim the slow card-draw (Meeting of Minds, Lorien Revealed) that doesn't impact the race. Sunscape Familiar and God-Pharaoh's Faithful hold the ground as 0/3 and 0/4 walls while you dig for answers and stabilize the life total.