1. Goblin Shamans. Although I don't know what the magic corruption entails, I'll take them.
2. I'll take Demonic Centaurs. More damage, less health, but harder to block.
3. I'll take Demonic Orcs because of their two attacks.
4. I'll take Shamans with chain lightning.
5. I'll take Demonic Chieftains because of their double attack.
6. I'll take Paokai. If they are heavily damaged, they will eat someone.
7. I'll take Free Orcs. They are more powerful and have higher initiative. But you need to be more careful with them.