Mono-White Aggro floods the board with small creatures like Novice Inspector, Thraben Inspector, Lunarch Veteran, and Raffine's Informant, so Fiery Cannonade is your best sweeper here and should stay in at full count. Cast into the Fire can snipe two of their 1-toughness creatures at once (e.g., Lunarch Veterans or Bird tokens) for efficient two-for-one value, complementing Fiery Cannonade. Spell Pierce is weak since it can't target creature spells and their curve is full of cheap one-and two-drops, so trim it for more anti-swarm tools. Watch for Thraben Charm as a combat trick/removal spell that scales with their board, so try to keep their creature count low.