There is also an exploit with this unique power that is fairly easy to do.
Basically, you loan out a number of mercenaries (such as Numidian Cavalry) for 20 gold per turn each. With the gold you earn from their employment, you hire your own mercenaries (these can even also be Numidian Cavalry!) for half the price, because of the UU.
Simply repeat and you end up loaning mercs out for full price, and hiring others for half that.
If for no other reason than this, I feel the power needs to be changed or at least adjusted.
I just checked and I don't see my own mercenaries in the pool
