User blog comment:VeiRetning/What UR Cards are worthy for Mirror Maiden?/@comment-32987645-20170830045907/@comment-29974411-20170907181629

Congrats on Bomby, thats an amazing drop! She's one of the top GUR Attack Buffers :)

Bomby is easily the better choice compared to Phantom Ninja for sure. Also you mentioned you have Huang Long, is she in GUR form? If yes I think there's even lesser reason to MM Phantom Ninja since Huang Long provides a 200% Defense Buff in GUR form.

For now I think because you are using HSRs/URs, you will focus on a lot on getting/capping defense which is understandable but then later on as you play more of the game and get more cards to switch to a full GUR or higher teams, the defense will become less of a focus as cards survivability increases. When that time comes, Bomby will serve you much better. Also, Bomby also have a second skill which heals your cards so she might help your null survive 1 more tap for now.

If I were you, I will go for Bomby although she might not be the 100% perfect choice for now, but I don't think it's a decision I will regret later on for sure :)