While narrow in its use case, there are some battle conditions that are exceptionally well-positioned for Zyriel. I've found her excellent on the death team sandwiched between Riftwing and Chaos Agent at the back for sneak protection. I would probably use her on a life team more if I had truthspeaker, but that is a different story. Because I wanted specifically GF though, I didn't buy any from the company, instead buying directly from the market in the $200 range.