Storm Sculptor

• WWizards of the Coast2017-09-29
  Official Ruling
  Storm Sculptor’s last ability doesn’t target the creature you’ll return to hand. You choose one as the ability resolves. No player may take actions between the time you choose a creature to return and the time you do so.
• WWizards of the Coast2017-09-29
  Official Ruling
  Storm Sculptor’s last ability isn’t optional. If Storm Sculptor is the only creature you control when the ability resolves, you’ll have to return it to its owner’s hand.

Rulings via Scryfall