8 tonics and still holding back. Should I be?

[Radar1]

I was in similar situation

What should I do with Horghall?

[Screenshot_2019-04-29-12-42-35] I have 8 tonics, I saw many opinions about him (almost only bad) but as a F2P I must play with heroes who I have. @JonahTheBard I saw you have him maxed, how usefull is he? There is rest of my heroes if this matter [Screenshot_2019-04-29-12-42-22] [Screenshot_2019-04-29-12-42-27] +another Kiril at 3^60 Thank you

I decide to wait and nothing except more tonics, I decide to wait little longer and got Lianna from first or second TC20 training.