On quick battles, a level 1 Tazar with a hydra on the swamp easily defeats 3 black dragons or 3 archangels (but for some reason, he can't defeat 3 angels), but he can't kill even one behemoth. He can also defeat a guard of 100 grubs or 3 wasps. That's how it is.
If you think about it that way, 5 hydras would be enough for utopia. And if Tazar is leveled up, maybe even two hydras would be enough. Then it would be awesome!
I wonder, how do cerberuses behave?