"Regenerating Mummy"'s effect will activate when sent to the Graveyard by the effect of "Morphing Jar" or "Card Destruction".
"Regenerating Mummy"'s effect will activate during the Damage Step because of "Spirit Reaper" or "Don Zaloog".
"Regenerating Mummy"'s effect will activate when destroyed and sent to the Graveyard because of "Chain Destruction".
You can chain to "Regenerating Mummy"'s effect.
You cannot use the same "Regenerating Mummy" for both parts of "Delinquent Duo"'s effect.