The main issue i find with Hagatha is that it is considered a value late game card, yet there are some bad shaman spells you can get. At the very least i would wish if we could get rid from Totemic Might from the possible spell pool , because after all you don`t even have totems any more to use it with. LIke for example the buff that was made to Bane of Doom, (summoning more demons than the basic ones). Though it did not make the card strong anything, at least it got more exciting to play. And Hagatha should be stronger imo (just look at Dr Boom or Zul’Jin).
I would say that it would be nice to not constantly get murloc fishing when my deck has no murlocks in it but I think what needs to be done is make those cards less likely to appear than remove them, so they can still appear for the odd occasions when there actually usefull, if there removed hagatha gets a huge buff where it could be problematic where people constantly get hex while if the chances were lowered it’s only a slight buff and keeps her balanced
As it is, Hagatha is already pretty strong. Getting all those extra spells adds a huge amount of value.
Changing the pool to increase the chance of those spells being impactful would make her way too overpowered.