Two words: combo disruption!
The last Hearthstone meta was infested with OTK combo decks that were too powerful. Hecklebot was created to disrupt those decks and potentially concede on spot.
It is functionally the same as Dirty Rat, and those who had the chance to play it remember what trouble that card could create for many combo players. That makes Hecklebot a welcomed return of that mechanic. You can bet this one will see play in this meta.