Rastakhan's Rumble Guide
Every dying beast makes this dreaded carrion bird stronger.
I think there is a glitch because on my first run as tracker I got to the 8th boss and it was gobbles, there was only 10 cards in the deck so I fatigued gobbles to death. But on the wiki it doesn't even show gobbles as able to be a final boss. (Side note: when I faced gobbles as the 8th boss, it had 70 health)
also got it as 8th boss on tracker, he didnt have the same hp and started with 3 mana iirc
Well, I heard that changing a hero (via Death Knight or Jaraxxus) changes your class and the game defines your 8th boss judging by the class you won the last game. For Tess (Rogue) it's Captain Shivers, for Darius (Warrior) it's Godfrey, for Toki (Mage) it's Infinite Toki and for Shaw (Hunter) it's Glinda. But, if you win with a class which does not have a Hero (Paladin, Shaman, Druid, Priest or Warlock) you get Gobbles.