Miser loves boards with nice sifting, and strong engine support. There is a massive premium for increasing the rate at which you can hit Miser. University, Ironworks, Workshop, etc. can all allow you to build an engine without needing as much early cash so Miser can thin out ever quicker. Cards like Warehouse and Scheme are also very useful for getting you to high value Misers quickly. Events, like Mission or Expedition all can make Miser help you thin out that much faster.
And of course Miser shines insanely well with limited draw Engines - Wt, Lib, Menage, maybe even Jack all make for strong Miser play by allowing you to draw back the lost buying power and having disappearing cash is clutch on those boards. For similar reasons, I like Miser on Tactician boards.
Ultimately, Miser is like Trade route - a very slow trasher you power up - but one that your opponents cannot draft off. Not a crazy powerful thing, but decent on most any engine board that lacks other trashing.