I think it's evident that this team sucks and desperately needs to tear down the roster. The amount of trade chips the Penguins have is a bit limited, but I think the main ones are:
-Pettersson: 1 year at $4 million
-O'Connor: 1 year at $925k
-Eller: 1 year at $2.45 million
-Rust: 4 years at $5.125 million, Penguins likely need to take a bad deal back
-Rakell: 4 years at $5 million, Penguins likely need to take a bad deal back
-Nedjelkovic: 2 years at $2.5 million
Karlsson and Bunting are also potential trade chips, but both need to start playing better for either to be worthwhile in a discussion (plus Karlsson would require significant retention and the Penguins only have 1 retention slot left this year). I think everyone else on the team is either untradeable, won't be traded or has no value.
A couple of ideas I have:
-Pettersson to Vancouver for Elias Pettersson (defenseman) and a 2nd
-Rust to Detroit for Copp and additional futures