Does Pawniard's "Change Order" attack only include Pawniard in play, or does it also include any Pawniard cards in the Discard Pile?
It only counts Pawniard in play, including itself. It does not include any in the Discard Pile.
Source: Steam Siege FAQ (2016-08-04), TPCi Rules Team (2016-08-04)

Relevant cards

Note: All applicable cards may not be listed below.
XY11_63