I would have fleshed out an equivalent number of possibilities if any of the other options had won, but Dwarf option would have been doing harm to Gork and Mork and probably Karag Nar, Wizard option would have had a permanent effect (for good or ill) upon the local Winds, accepting Mork would have had all sorts of potential effects as you become at least slightly orky, and the human option would have avoided most of the 'better hope you don't roll 1' sorts of consequences.
So:
-Dwarf - Kragg says fuck you, Gork and Mork get punched in the face and Karag Nar maybe explodes from the resultant fire.
-Wizard - Mathilde rams vast amounts of energy into the Karag, most likely being Waagh > Dhar > Ulgu(if she somehow threaded the needle and converted it while dumping it), generating appropriate side effects. PROBABLY annoys the dwarfs though, since I don't think they'd enjoy most of those.
-Mork - Mutate. This was PROBABLY the obvious trap option(much like taking Dhar during the Drakenhof campaign), which MIGHT work but even if it does becoming more orky ranges from awkward(Mathilde gets tall and ripped), to various levels of disruption(Mathilde gets an orc alter ego when she's angry, or outright turns green)
-Human - "DUCK!". Mathilde comes out singed, possibly half naked, but no chance of fucking worse than dead
iirc
Bad and Dramatic: As per bad and all greenskins everywhere gain Hatred: Mathilde
Bad: Rogue Idol Of Only Gork wakes up about five feet away from Mathilde
Dramatic: Escalation, roll again except the results are even more so
Good and Dramatic: Global war between goblin and orc
Mathilde: "And now the important part: Look like I know what I'm doing."
...wonder what happens if we roll Dramatic then rerolled into Good and Dramatic.
It could be read either way. Gork and Mork are the second-strongest pantheon in existence after Chaos, so a small fraction of their power being a huge upgrade for Ranald isn't unfeasible.
Also Ranald is possibly the weakest major human god outside of local saints and spirits, who stretches his power thin because he personally attends to his followers, so he doesn't have a lot to throw around on the big events..
Hmm. Another thought. Now Mathilde is experienced at feeding Ranald raw Aethyric power I wonder if it would be possible to do the same with her backlog of snake juice to help create Ranald the Magician. She's just witnessed a god modification ritual, so may be aware it's the kind of thing that's possible.
Not easy, of course. She'd probably need to learn ritual magic and establish a public perception of him on that role.
I think the public perception is the harder part. She just plain doesn't have enough energy to create it instantly, and publicizing Ranald is itself inherently contradictory to some extent, making it harder.
Not to mention as a faithful of him, deliberately changing your chosen deity is rather hubristic without a sign that your god wants the change.
That said, we hadn't seen what Ranald is investing his loot into yet, so theres that.