Making this card belong to Seekers is a baffling decision: there just aren't that many spell cards in their class, and some of them cost 0 already (https://arkhamdb.com/find?q=k%3Aspell+f%3Aseeker&decks=player)
I get Agatha is a Seeker but she is also a Mystic. so I don't see the reason why to gate this card to be Seeker-only: it should be Mystic or double class
This already suffers from the issue of other economy cards (if you draw it early, great! If you draw it later in the level, it's useless), and it's only useful if you are planning to Investigate/discover clues, but printing it as a Seeker-only card kill all of its utility.
Right now the only people I can see this being even remotely okay on are Seekers with Mystic access, like Daisy, or Mystics with Seeker access, like Marie and Luke