Evro
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Phoenixes, the ones you get in the tent in exchange for artifacts, are completely useless.
If you have 200 Druids, it means you've been searching for Koly for too long. It's all about speed. Actively use Astral Gates, teleport to the city, and use reinforcements. I managed to defeat Koly when I had around 80 Druids and 230 Archers. But I used two heroes; the second hero had all the growth from the first captured Necropolis castle, plus a little from the second, which was almost not built. Koly saw us both and hid in the castle, but first, I scouted him with my secondary hero, and then I finished him off with Fedya, who was already half-dead.