@SuricrasiaOnline I wrote about the history of this a few months ago, when the accusations of antisemitism started flying. https://gdorn.circuitlocution.com/rpgblog/history_of_phylactery.html
Originally the self-resurrection effect was a modified "soul jar" / "magic jar" spell. It seems fine to call it one of those.
It's still unclear to me that Jewish people want 'ownership' of the word; it's an outsider's word even in the original Greek and several Rabbis argue for "tefillin" whenever it is more accurate, like in museum collections.