This mirror match against an identical UR Aggro list comes down to who develops a better clock and protects it with more efficient interaction. Colorstorm Stallion's ward 1 and growing Opus trigger make it a resilient threat that's awkward for their Burst Lightning to profitably answer. Spell Pierce is excellent on the draw to protect our own key spells or punish their cantrips and burn when they're tapped low. Impractical Joke's 3 damage doesn't reliably kill their Elusive Otter once prowess triggers push it past 1 toughness in combat, and Secret Identity is less valuable in a race where both players are attacking rather than defending. Sequence spells carefully since both decks have the same payoffs and interaction suite.