Mono-White Aggro has many evasive attackers (Battle Screech tokens, Leonardo, Big Brother once pumped), so Stonehorn Dignitary, looped with Ephemerate's rebound and Ghostly Flicker, repeatedly skips their combat phase and buys the time our grindy engine needs. Remove Soul counters the creature spell before its enters-the-battlefield trigger matters, denying the Clue from Thraben Inspector or Novice Inspector, or the bounce from Kor Skyfisher. Both Negate come out since their deck is almost entirely creature spells with few noncreature targets. Goliath Paladin's initiative stays in the board since their many evasive attackers would simply take the initiative right back.