Well, you cn check what mercs are in thr map hovering the mouse on the saloon/tavern, no need to build it
Mercenary contractor increasing tavern build limit might be a better option.
+1 on Merc Contractor give Tavern wagon and build limit, and another build limit for the imperial option. Additionally Merc Contractor are most useless for Portuguese now as it give Ronin and Lil Bombard, there is card that enabled Ronin to be trained at Tavern, so Ports only get to train 2 instead of 3 like other civ. Perhaps change it to Elmeti or Stradiot?
Inventor can have more benefits if it also give Exp crate.
This is an old post I made on my forum, so back then it wasn’t stated which mercenaries would be available.
The point is that sometimes mamelukes and corsairs are already available, so advancing your age with this politician is practically useless. Said to unlock these units, when in fact sometimes they are already unlocked.
For me the Mohawk Statesman should make Haudenosaunee Tomahawks and native scouts trainable.
I love the Mercenary contractor best politician for me.