This is a pure speed mirror, so Pyroblast and Red Elemental Blast stay in the board since the opponent's only blue card, Sneaky Snacker, never gets cast. Relic of Progenitus exiles Snackers before they can return from the graveyard on a third draw, denying free blockers/attackers late. Searing Blaze is a two-for-one that kills Voldaren Epicure, Sneaky Snacker, or Guttersnipe while also burning the opponent's face, which is great in a race. Cut the weakest card-filtering copies (Faithless Looting, Lava Dart) and a Melded Moxite since this matchup is about efficient damage, not incidental value.