Did the order of Gobbler’s special get changed, as Kerridoc suggested? I note that the card posted in this thread lists damage THEN eating. However, looking at his current card it now lists eating THEN damage, implying a change.
Anecdotally, I recently fought him in an Atlantis stage, had some minions up, allowed his special to fire, and it seemed that the order was eating then damage. I’m not 100% sure because I was distracted; I had planned to block his special with Merlin, but a HUGE cascade filled his mana much earlier than I had anticipated, so I wasn’t ready to closely observe what happened.