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Hmm... I completed the entire campaign on normal difficulty without losing a single battle.
1 main hero is a mage. The second hero has logistics, resource gathering, and growth skills.
(I used this strategy in all missions.)
Anastasia's skills: Dark Magic: Weakness, Dominate. Earth: Restoration. Stop Time. Marksmanship. And other skills to increase Magic Power and Primary Skills. And Reinforce.
In the first mission, there are only Ghouls as melee units. Give them vampirism and restoration, and go on the attack. Use the primary hero to help resurrect them + the race's skill also resurrects, and that's it, everyone is doomed.
Added after 51 seconds
P.S. I never took Tactics, and I completed all missions in three campaigns without it.
And Tactics also helps Anastasia now, it's great against Orcs, as they jump across the entire field. You position your army behind rocks/obstacles and avoid the initial rush.
Anastasia has a skill that increases the speed of Ghouls; I haven't tried it yet, but if you take Improved Tactics + mass acceleration, then Ghouls will also jump across the entire field.