Necronix
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What about this trick? With the Devil, you click "wait." At the end of the turn, you attack the enemy without retaliation, and at the beginning of the next turn, you return to your starting position. Since the Archdevil has decent speed, it works quite often.
I hate playing as elementals – the city lacks character, and they're also overpowered.
Necropolis is also overpowered, in my opinion, but I like their city's spirit.