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Kuriotate Scholar
I personally like the idea of gaining units from wonders, since wonders take long periods of time that could be used getting ready for a war, or trying to repel an attacking force.
In my opinion more wonders like the Pact of Nilhorn (I think that's how it's spelled) would give builders a better chance against civs of the opposite theology (i.e. Good v. Evil), and would give warmongers a reason for building wonders.
The units granted don't necessarily need to be overpowering, maybe some specialized troops for destroying a certain type of unit (such as a wonder that gives a unit that would destroy arcane units ability to cast spells for x number of turns).
In my opinion more wonders like the Pact of Nilhorn (I think that's how it's spelled) would give builders a better chance against civs of the opposite theology (i.e. Good v. Evil), and would give warmongers a reason for building wonders.
The units granted don't necessarily need to be overpowering, maybe some specialized troops for destroying a certain type of unit (such as a wonder that gives a unit that would destroy arcane units ability to cast spells for x number of turns).