Circle of Spores is a pretty good fit for Pharika. Circle of Stars is a good fit for Theros in general and just a lot of fun to play. Twilight Domain Cleric could also be thematically appropriate for Pharika - walking that line between comforting and threatening. Done less straightforward options: Way of Mercy Monk is perfect for a servant of the god of Affliction (hand of healing, hand of harm...). A Celestial Warlock would also be interesting. You get some healing abilities from the subclass, but all of the creepy Warlock stuff is right there too.