I like champed Sersi much better than I was thinking I would, but I haven't really found a non-Shang-Chi team that can really showcase her deal that I'm happy with yet. She seems like she can really pump up specials a lot on green.
Sersi works well with cascades machines, like Onslaught. My fave team now is Shangi-chi, Onslaught and Sersi. Use her purple to target colours you don’t need, and match 4 and match 5 will occur at a great rate.