Starscape Cleric's inability to block is a liability against a deck that floods the board with big creatures, and Liliana the Faultless dies easily to combat. Clarion Conqueror is a 3/3 flyer. Icetill Explorer's and Mightform Harmonizer's landfall abilities are triggered abilities, not activated ones, so Conqueror does not stop them, and it can't stop Ba Sing Se's earthbend or Escape Tunnel either, since those are lands. It still provides a strong flying beater and shuts off Keen-Eyed Curator's activated ability of exiling cards from graveyards, because Conqueror stops activated abilities of artifacts, creatures, and planeswalkers. Keep in mind it also turns off our own Ajani Resolute's loyalty abilities while it is on the battlefield. Curious Farm Animals trades with their small creatures and nets extra life. Keep the full lifegain core intact since it races their landfall plan well.