Solmyr, Demeer, and Aislin are cheaters (and/or) kamikazes; do the rest have a right to exist?

Besides Galthran, the Necro faction has decent Clavius, Tamika, and Isra, whom I would prefer over Tantu. He is only effective on a well-rich map.

+1! Except for Isra. It's really not profitable to pick her under the current HeroesWorld rules. But without restrictions, Isra/Vidomina are THE BEST. The rest are just outclassed.

By the way, you forgot about Charna. A very good hero. No zombies and the speed boost from rags is great.