Mono Green Landfall wants to establish early mana dorks like Llanowar Elves and Icetill Explorer to accelerate into Mightform Harmonizer and Earthbender Ascension, leveraging Fabled Passage and Escape Tunnel to trigger landfall repeatedly and grow their threats out of range. Abrade is the priority answer for their one-drop accelerants — killing a Llanowar Elves or Icetill Explorer on turn one denies them the tempo needed to outpace your larger threats. The third Pyroclasm gives you a critical mass of sorceries that can wipe their early board of small creatures before landfall synergies compound, and Ill-Timed Explosion handles whatever survives into the mid-game when individual removal isn't enough. Spell Pierce is nearly dead against a deck that wins through creatures and land drops rather than key spells, and Winternight Stories is too slow when you need to stabilize the board before their Mightform Harmonizers become unmanageable.