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Well, if this "miracle" is Diabolic, and also a "domovoy" on top of that.
Against Ossir, I would also add Anwen and Marbas to the 20% category. But Vitus, Ibbu, and Helmar, I would increase to 50%, especially Vitus.
Against Iris, I think Ibbu would be a good choice, and Orson at 50% or more.
And against Helmar, I would add Anwen and maybe Marbas.
Jaliba is popular because he gives a lot of magic damage, plus magic bonuses... and that's even without a developed Chaos skill!
+ phoenixes with their revival ability, etc. In general, he's a strategic hero, and if the area is full of objects, he can defeat almost anyone.
The confrontation between Jaliba and the Necropolis is interesting here.
Deydra has a 99% chance of losing against Jaliba, but Ravenna has a 99% chance of winning against him... and Orson wins about 75% of the time... it depends on the terrain, but more often than not, he wins, even with a bad terrain.