Gullin is already great even before they accidentally turned it into firing the damage after recasting the skill. Now they fix it back to the state that it should be which is not firing the damage after recasting the skill. As Gullin was already great in the original state, Gullin is also great post-fix. Imo, the unfixed state was OP.
The patch (v.39) never said anything about changing Gullin’s skill, the change was never announced. There was a thread asking clarification, and SG answered that it was unintended bug. They did promise to fix it in this update:
The card said: when the effect end.
Recasting the skill do not end the effect, it extend it. So normal intepretation of the card description is recasting do not trigger the damage.
A little reminder: