I am sorting through some rulings on that UDE list manager thing and I came across something that had me interested. Regarding Horn of Heaven and Solemn Judgment Vs. Monster Reborn. Horn of Heaven cannot respond to Monster Reborn effect of the Special Summon, which is odd because why is it we can activate Torrential Tribute in response to Call of the Haunted or Premature Burial? Same went for Solemn Judgment with the Horn of Heaven scenario, except you have to negate the card itself instead of after the monster is on the field.