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

I'm getting tired of repeating myself. Solmyr with his chain lightning, DeMeer and Aislin with their rain spell (we'll keep the restriction on building Grand Magus for them). The rest – Loïc, Coronius, Xeron, Alamar, Zheddit – are just weaklings! I want to give players the opportunity to use them too!