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

These are all artificial situations. In reality, a kamikaze mage will cause a lot of trouble...

If a kamikaze hero, who heroically dies and gives away artifacts while severely damaging the opponent, is actually good, then what's the point? In general, such mage heroes like Solmyr and Dimir should be able to compete on equal footing with fighters and bring victories.