Creepy Doll

• WOTC Official Reminder Textofficial rules
  Indestructible — Effects that say "destroy" don't destroy this permanent. A creature with indestructible can't be destroyed by damage.

• WWizards of the Coast2011-09-22
  Official Ruling
  You don’t flip the coin until the ability resolves. If you want to respond to the ability, perhaps by regenerating the damaged creature, you’ll have to do so before you know the outcome of the flip.
• WWizards of the Coast2011-09-22
  Official Ruling
  If the combat damage Creepy Doll deals to a creature is lethal, you’ll still flip a coin. If the creature is still on the battlefield (perhaps because it regenerated), it could be destroyed a second time, depending on the coin flip.

Rulings via Scryfall