Blood for Bones

• WWizards of the Coast2019-07-12
  Official Ruling
  Any abilities that trigger as the creature card is returned to the battlefield won’t resolve until after Blood for Bones is finished resolving.
• WWizards of the Coast2019-07-12
  Official Ruling
  Blood for Bones doesn’t target the creature cards to return from your graveyard. This means that, while the spell is resolving, no player may take any actions between the time you choose the cards and return them.
• WWizards of the Coast2019-07-12
  Official Ruling
  The creature sacrificed to cast Blood for Bones may be one of the cards chosen to be returned.
• WWizards of the Coast2019-07-12
  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 Coast2019-07-12
  Official Ruling
  Once you begin to cast Blood for Bones, no player may take actions until you’re done. Notably, opponents can’t try to remove the creature you wish to sacrifice.

Rulings via Scryfall