I really like her art and her ability seemed pretty fun, so I tried putting her in my Battle Trance Alchemy deck since it had some self-damage already (druids, havfrues, mardroems). I added some Dimun Light Longships too, and I never really had any problems getting Cerys out.
And once she's out, man the combos with her order ability are fun. Here are two I've found:
Have a Havfrue Singer on board. Heal something and kill one of the siren tokens. Because you've healed, another siren token will come out.
Hav Crowmother and unclicked Little Havfrue on board. Click Little Havfrue, heal the 4 damage, then kill Crowmother. Play alchemy card to bring out Crowmother again. Cerys' ability just played for 4 points of heal + 2 turns of rain.
The one problem I've seen though is that Offering to the Sea doesn't seem to count as self-damage for her counter. If this is a bug and will be fixed in the next patch, Cerys is going to be really good in Gedy/Alchemy decks imo.
Source: https://www.reddit.com/r/gwent/comments/rdotx9/cerys_fearless_is_absolutely_fun_to_play_in_an/
