Ataman
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The best artifact is the King of the Undead's cloak; once you have it, victory is guaranteed.
I also like the Angel Wings, Orator's Hat, and Book of Air.
Most often, my hero is a Warrior, so the Sphere of Inhibition is essential (too bad for the Mage :D).
And of course, the Angel Alliance, Father Dragon's Might, and Titan's Gladius!