Fall of the Gavel

• WWizards of the Coast2012-10-01
  Official Ruling
  You must be able to target a spell to cast Fall of the Gavel.
• WWizards of the Coast2012-10-01
  Official Ruling
  If the target spell is an illegal target when Fall of the Gavel tries to resolve (perhaps because it’s been countered by another spell), Fall of the Gavel won’t resolve and none of its effects will happen. You won’t gain 5 life.

Rulings via Scryfall