Pretty sure it was Anna from one of Aigis' anniversaries. Fran is worth spending SCs on. I would at least try to get her to -3 or mincost/+5. Don't think Emilia will be worth it. We'll be getting yet another valk in the next event anyways.
On topic: Finally perfected Selina. Took me 20+ copies just to get her to this point. A few more levels till tin cans and max level. Since the daily revivals have been for farm event units only, I hope we get Sabrina, Lieselotte, Isabel, Charlotte, Chloe, Juno, Helena, or Rika on the next wave.
Edit: And Prim just became one of my most wanted units. That OP'ed AW skill! She is like a better witch version of Rita after awakening.
Platinum Witch Prim (幻光の魔女プリム)
AW Skill
Prism Shadow (プリズムシャドウ): (00s; cannot be targeted; auto skill, and unlimited duration; AS: ; WT: ; CT: )
AW Ability:
Prism Mirror (プリズムミラー): possible to deploy a token that is identical to Prim; can only deploy one on the field; doesn't count towards unit total.