Aerial Predation

• WWizards of the Coast2012-10-01
  Official Ruling
  You must be able to target a creature with flying to cast Aerial Predation.
• WWizards of the Coast2017-11-17
  Official Ruling
  If the creature with flying is an illegal target when Aerial Predation tries to resolve, it won't resolve and none of its effects will happen. You won't gain 2 life.
• WWizards of the Coast2017-11-17
  Official Ruling
  You must be able to target a creature with flying to cast Aerial Predation.

Rulings via Scryfall