This is a fast aggro mirror where Mono-White's key trump cards are Prismatic Strands and Guardians' Pledge — Strands can completely nullify a lethal attack for zero mana if they have a white creature in the graveyard, so avoid committing your entire board to a single swing when they have open mana. End the Festivities is excellent for clearing their Novice Inspectors, Lunarch Veterans, and Thraben Inspectors before they can go wide with Battle Screech spirit tokens, since End the Festivities does not damage spirits. Searing Blaze is efficient removal that doubles as reach, ideally targeting a Kor Skyfisher (which can bounce Strands back to hand) or a key token-producer. Experimental Synthesizer and Reckless Impulse come out because this is a matchup decided on the first few turns — you want your hand full of threats and direct damage, not slower card flow. Prioritize burning their life total directly when you can, since they will stabilize behind Strands and Guardians' Pledge if you let the game go long.