First, let me say that I appreciate all the work done on Too Tough to Die and Reckoning. I just started playing Doomtown about six months ago (I have been a long time MtG player prior to that). The art, balance, abilities etc. on these new sets are well thought out and among the highest quality.
I would like to see a servitor that rewards players for building a deck without duplicate cards (also commonly referred to as a "singleton" deck in many TCGs, where only 1x of any card in allowed).
Many games I play have players putting x4 of the same action cards etc. and it ends up making decks feel very "samey" and less exciting because the decks usually have the same pattern of action cards. A servitor with a condition that a player could only use him if there are no duplicates cards in the deck, would encourage players to expand deck building options and avoid the same 4x pistol whips found in many decks. The servitors benefit could be a mere production bonus, or something simple. Doesn't have to be competitive or unbalanced, just something to give players a reason to build a singleton deck in casual play.