Good ascendancy for an Oshabi Unleash build?

Hi. Saw the Oshabi bloodline and it makes me want to try an Unleash build.

I just think blasting my retinas with big unleashes from Crackling Lance of Branching and/or Firestorm would look Neat™. Arc is fine too.

Do I just slap it on an Archmage Hierophant mana stacker? Seems like giving up 2 ascendancy points is hard for Hiero, but I could at least have that 'any spell works' base to pivot to if the Unleash playstyle doesn't work for me. Maybe it's easier to fit a bloodline on Inquisitor? Elementalist?