Xokke_SuG
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Actually, I don't think that every city necessarily needs a mage. Support is probably essential. But the support function can be taken over by a creature of any role, even a ranged unit or a melee unit... The main thing is to play it smartly.
However, the support role might not be very suitable for fast-moving melee units and flying creatures.
No, micro-casting by creatures plays too important a role, as it helps warriors and allows mages not to waste a turn on an extra buff or debuff. Although, that's just my opinion.