Masterful Ninja

• WWizards of the Coast2018-01-19
  Official Ruling
  If you try to move Masterful Ninja from the battlefield to your hand or vice versa, and it's in both zones, it will just stay in both zones. For example, if Masterful Ninja is in both zones, casting Unsummon targeting it won't do anything.
• WWizards of the Coast2018-01-19
  Official Ruling
  Masterful Ninja's first activated ability doesn't cause any enters-the-battlefield abilities to trigger. When the turn ends and Masterful Ninja stops being both on the battlefield and in your hand, this won't cause any dies or leaves-the-battlefield abilities to trigger. If Masterful Ninja enters or leaves the battlefield some other way, those abilities work as normal.
• WWizards of the Coast2018-01-19
  Official Ruling
  If Masterful Ninja is destroyed or discarded, it goes to your graveyard. It will no longer be on the battlefield or in your hand.
• WWizards of the Coast2018-01-19
  Official Ruling
  Look closer.
• WWizards of the Coast2018-01-19
  Official Ruling
  No, that's a table.
• WWizards of the Coast2018-01-19
  Official Ruling
  It's right there.

Rulings via Scryfall