[Evilhomer]

It seems you judge nations on how strong/imbalanced their early game units are (especially their sacreds). If this is the case I recommend: Lanka(EA), Niefelheim(EA), Helheim(EA) and maybe vanheim(MA).

If you are looking at other very strong/potent nations I would recommend strong blood nations, since blood hunting in mid/late game can be very potent. If that suits your game play check in Miclan(EA), Miclan(LA) and Marignon(LA).

Other very strong nations that plays very differently are Ermor(LA) and Rlyeh(LA).