Run Away Together

• WWizards of the Coast2022-06-10
  Official Ruling
  If one of the two target creatures becomes an illegal target, Run Away Together can still determine its controller only to check whether the other creature is a legal target. If the illegal target has left the battlefield, use its last known information. If the other creature is still a legal target, it's returned to its owner's hand.
• WWizards of the Coast2022-06-10
  Official Ruling
  If both creatures are controlled by the same player as Run Away Together tries to resolve, both targets are illegal. The spell doesn't resolve.
• WWizards of the Coast2024-07-26
  Official Ruling
  If one of the two target creatures becomes an illegal target, Run Away Together can still determine its controller only to check whether the other creature is a legal target. If the illegal target has left the battlefield, use its last known information. If the other creature is still a legal target, it's returned to its owner's hand.
• WWizards of the Coast2024-07-26
  Official Ruling
  If both creatures are controlled by the same player as Run Away Together tries to resolve, both targets are illegal. The spell doesn't resolve.
• WWizards of the Coast2025-11-17
  Official Ruling
  If both creatures are controlled by the same player as Run Away Together tries to resolve, both targets are illegal. The spell doesn't resolve.
• WWizards of the Coast2025-11-17
  Official Ruling
  If one of the two target creatures becomes an illegal target, Run Away Together can still determine its controller only to check whether the other creature is a legal target. If the illegal target has left the battlefield, use its last known information. If the other creature is still a legal target, it's returned to its owner's hand.

Rulings via Scryfall