Selesnya Landfall is green-white, so Flashfreeze answers its green half — Mightform Harmonizer, Earthbender Ascension, and Llanowar Elves are all legal targets. Disdainful Stroke covers their bigger spells like Mightform Harmonizer or Icetill Explorer. Your slow top-end creatures are liabilities against a deck trying to go wide and pump quickly, so trim for interaction while keeping Deadly Cover-Up and Day of Black Sun as your primary sweepers against their go-wide plan. Prioritize discarding or killing Mightform Harmonizer and Earthbender Ascension before they compound landfall value.