Selesnya Landfall wants to go wide and pump creatures with Earthbender Ascension and Mightform Harmonizer, so we want flexible answers to their bigger threats rather than narrow ones. Get Lost and Pyrrhic Strike can destroy Earthbender Ascension or a large threat outright, while Pyrrhic Strike can also blight one of our own creatures to destroy an artifact or enchantment and a creature with mana value 3 or greater in the same spell, like Mossborn Hydra. Dawn's Truce protects our board with hexproof and indestructible after they've gone over the top with landfall triggers, keeping our creatures safe from their removal or a sweeper effect. Emptiness's -1/-1 counters are too small against their bigger, counter-laden threats, so we trim it for more impactful answers.