Duress lets you strip a key enchantment like Earthbender Ascension before it snowballs into repeated +1/+1 counters and trample, which is one of the hardest things for this deck to interact with. Get Lost gives you a clean answer to a resolved Earthbender Ascension or Mightform Harmonizer at instant speed. Requiting Hex is only a partial answer since it misses Mightform Harmonizer and Mossborn Hydra once it grows, so one copy comes out; Practiced Offense is too slow against a deck that wants to go wide and pump quickly.