As of right now, according to the text, Octomasseuse and Always a Bigger Jormungar should be a combo.
Octomasseuse: Deals octuple damage to minions
Always a Bigger Jormungar: Give a minion +2 Attack and “Excess damage dealt by attacks hits the enemy hero.”
So the way it reads is that if you combo these two cards, Octomasseuse will deal 24 damage to a 1hp minion, there should be 23 excess damage to your opponents face.
Instead the card is calculating the base damage difference. So you will hit -8 to the minion, and -2 to the opponent’s face.
Weird that the calculation is skipping over the part that ON the minion there is an excess of 7 damage being ignored.
tl;dr
Always A Bigger Jormungar is not calculating damage properly when minions have text specific damage modifiers.