Mono Green Landfall ramps into big threats like Mossborn Hydra, which has trample and doubles its +1/+1 counters off landfall, and Mightform Harmonizer, which doubles a creature's power off landfall. Chainsaw's 3 damage on entry can snipe an early Llanowar Elves or Sazh's Chocobo before it snowballs, and its growing +X/+0 helps you race. Shattered Acolyte provides a cheap lifelink blocker and can sacrifice to destroy a problematic Earthbender Ascension if needed. Doc Ock's Tentacles and Basilisk Collar are too slow against a deck that can out-size your creatures quickly with +1/+1 counters. Keep pressure on early since their mana creatures and landfall payoffs get out of hand if left unchecked.