Fling

• WWizards of the Coast2019-10-04
  Official Ruling
  Players can only respond once this spell has been cast and all its costs have been paid. No one can try to interfere with the creature you sacrificed to prevent you from casting this spell.
• WWizards of the Coast2019-10-04
  Official Ruling
  You must sacrifice exactly one creature to cast this spell; you can't cast it without sacrificing a creature, and you can't sacrifice additional creatures.
• WWizards of the Coast2024-04-12
  Official Ruling
  Use the sacrificed creature's power as it last existed on the battlefield to determine how much damage Fling deals.

Rulings via Scryfall