Profane Memento

• WWizards of the Coast2014-07-18
  Official Ruling
  Profane Memento’s ability will trigger when a nontoken creature you control but an opponent owns dies.
• WWizards of the Coast2014-07-18
  Official Ruling
  If Profane Memento is put into your graveyard at the same time as a creature card is put into an opponent’s graveyard, its ability won’t trigger.
• WWizards of the Coast2014-07-18
  Official Ruling
  Token creatures dying won’t cause Profane Memento’s ability to trigger.

Rulings via Scryfall