Sefris does trigger for itself

When Sefris dies, its first ability triggers "Whenever one or more creature cards are put into your graveyard from anywhere, venture into the dungeon. This ability triggers only once each turn." But it seems to be not an enters the graveyard ability, so it should not trigger for itself. I have not yet tested if it also triggers on mass removal, where it also should not trigger.

Search the Sefris card implementation and its triggered-ability handling, then reproduce the reported death case and the untested mass-removal case. Compare the observed triggers with the issue's expected Magic rules behavior; done means Sefris does not trigger for itself in either relevant scenario.

Written by the indexing model from the issue text.