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					Originally Posted by  Shardphoenix
					 
				 
				
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				You'll likely want some battlefield buff of your own to match, Army of
			
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 Is it a good idea to cast Army of *Whatever* against high-air enemy?  
			
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 When to use what buff I've left as exercise for the player, otherwise it'd be a 10 page guide.
But to answer your question and give another example from bbz's explanation, consider:
Eg. Mistform army is often cast through an air enabler like fairy queen for a non/weak air nation, which is quite common. For which case you'd use different buffs then say, against Caelum.