I'm also interested in the Deidre-Marbas pair. I'll upload a save with a Marbas victory later (for some reason HeroesWorld won't let me load replays:confused: ), but it doesn't say much, since the opponent made many unforgivable mistakes. A few months ago, I lost with Marbas myself, though I was playing against a much more experienced player at the time. So for now, I can't determine who has the advantage in this battle.
Marbas has a pretty significant advantage here. We tested this pair with Dexter once... He estimated Deidre's chances in this matchup at around 5 percent after that.
Tactics for Deidre: first turn Berserk on the Demonesses, they're usually positioned near the Overlords; in response, they can take out half the Demonesses with fire. Then Light spells, plus Vampire Lord on the Dragon on the fourth turn. That's the ideal scenario.
In reality: Berserk might be resisted, and the Dragons might not survive until your Vampire Lord arrives.
Tactics for Marbas: the positioning must be correct, namely: Demonesses hide behind Overlords and Demons, Imps are placed between two Devils, Hounds are on the other flank from the Demonesses, and the Devil closest to the Overlords shouldn't stand adjacent but one square away.
Everyone holds position in defense; when the Necromancers get close to the Demons, Marbas simply roasts them with fireballs (after which the Demonesses, if not Berserked, shoot the roasted ones); as they approach, place Mangals right in front of the Devils and Overlords, and that's it.)
No replays, since this pair isn't very popular on Ubi, but it should all be clear even without replays.
Now, Marbas vs. Oora, a pretty interesting matchup. I always thought Oora had a 100% advantage, but it turns out it's not so simple. Marbas can get such lucky resists that by the time the Archdemons drag the Golems out of the corner of the field, quite a lot of Hounds and Demonesses remain. So it's not a guaranteed matchup, though there might certainly be disagreements on this. Personally, I've only lost this matchup to yatohasy; he played really well back then, and I did too, but I still lost. That's why we play against strong players and practice.