We had this issue come up in a game last night, and we weren't sure how to handle it. Player A had Welding Jar and another artifact in play. Player B cast Naturalize targeting the Welding Jar. In response, Player A sacrificed Welding Jar to regenerate itself.
Is this possible to do? I understand that Welding Jar is going into the graveyard either way, as sacrificed creatures can't be regenerated, but can Welding Jar legally target itself with it's own ability?
EDIT: If this seems non-sensical, let's assume that Player A has something in play like Furnace Celebration that gives them a benefit for sacrificing the Welding Jar.