Mono-White Aggro fields a wide army of small creatures like Thraben Inspector, Novice Inspector, and token generators such as Battle Screech, so End the Festivities' 1 damage to each of their creatures can wipe out multiple 1-toughness bodies and Bird tokens at once while also dealing 1 to their face. Relic of Progenitus can exile their graveyard to deny Battle Screech's flashback and slow Search Party Captain's card advantage loop indirectly by limiting resources, though its main value here is incidental. This matchup is a straightforward aggro race, so we prioritize board-wipe-adjacent effects over narrow answers. Trim the weakest filler slots while keeping our full aggressive core intact.