Yeah, Auchenai+Mistress of Pain is already in the game to do infinite damage, so bending the rules is not a policy they are consistently using with regard to interactions like Divine Favor-Fatigue. It's not really fair when some priest discovers in an endgame position in arena "Hey, that guy has 2 cards in hand and none in deck, I can kill him if I put a Finnicky Cloakfield on my Jeeves", then it doesn't work, then later the same game he pops a Piloted Shredder and finds Mistress of Pain is a victim of an infinite damage kill.
If Divine Favor really needs to function the way it does now (because players are illiterate? Because it reaches the critical point of being underpowered if that 'draw one card take one fatigue' damage use case is no longer available? Because Jeeves has 4 health and omg how do you kill something so big in time?) then the text should simply be corrected to reflect its actual behavior, such as "Draw the number of cards you'd need to have as many in hand as your opponent."
Fun fact, Jeeves will actually repeat his draw quote multiple times when the infinite loop is supposed to happen, possibly because they had to do a crappy work around to break code that was working correctly at first.