Bane of Bala Ged

• WWizards of the Coast2015-08-25
  Official Ruling
  If Bane of Bala Ged attacks a planeswalker, the defending player may exile that planeswalker. Bane of Bala Ged will still be attacking and may be blocked as normal. If it’s not blocked, it won’t deal combat damage.
• WWizards of the Coast2015-08-25
  Official Ruling
  The permanents are exiled before blockers are chosen.
• WWizards of the Coast2015-08-25
  Official Ruling
  If the defending player controls only one permanent, that permanent will be exiled.

Rulings via Scryfall