Emperor Crocodile

• WWizards of the Coast2016-06-08
  Official Ruling
  The ability only checks if you control no other creatures at the time it triggers. It does not check again on resolution, so gaining control of a creature before then will not save Emperor Crocodile.
• WWizards of the Coast2016-06-08
  Official Ruling
  Emperor Crocodile’s ability will trigger if you don’t control another creature, even if it’s only for a brief moment during the resolution of another spell or ability (such as that of Brago, King Eternal).

Rulings via Scryfall