Save it. You never know when these things may be useful again. A lot of people said they'd disenchant extra artifacts from last year... I'm sure glad I didn't.
Neither did I,
But on my main I converted my excess artefacts from last year to this years.
Reason for it was pretty simple, I do not believe the will add former recipes endlessly to the MA and assume and roll on, roll off principle.
This means 1 item comes on, 1 item goes away.
A new Phoenix has arrived so the old wil go away, thats my assumption
According to my "guesswork" The coldfire will be more usefull for me that the normal phoenix artefact for next years phoenix.
But I could be totally wrong, and just trew away some awesome artefacts.
The future will tell if I was wrong or right.
Now I can't wait for next years event