Meteor Blast

• WWizards of the Coast2015-11-04
  Official Ruling
  Meteor Blast can’t target the same permanent or player more than once.
• WWizards of the Coast2015-11-04
  Official Ruling
  If some but not all of Meteor Blast’s targets have become illegal by the time it tries to resolve, it will deal damage to the remaining legal targets. Illegal targets won’t be affected.

Rulings via Scryfall