Crol
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Well, if you're going to counter something, you should ONLY counter Darkness. Because summoning creatures on large maps is not very effective when Cyclops are fighting dozens of enemies, and a single Phoenix is more likely to be a joke. But things like controlling creatures, Berserkers, and large numbers of units can really shine.
And yes, a maximum-sized map is almost a guaranteed victory. But there's one small "but." It's possible, though difficult, to arrive on the 4th week and rush with Orson, which is a death sentence for an unprepared Orc. Just keep an eye on the tavern for a Necromancer hero, and you won't have any problems.