Wow, I was only a few days away.
From how I see it Seraphs ability isn‘t a cloning effect. People are right that usually something like Glasspool Mimic might work with an ability like Spines. But from how I read the Seraph it isn’t a cloning effect, so the text box will still refer to a card called Spine and not the Seraph itself.
But I might be in the wrong here. It is an Un-card after all.
Can you look up where you found those rules to confirm for us?