Not sure if this would have any legs, but just something I thought up when thinking about some teams' (especially NYR) needs.
It's very rare that a deal this significant happens at all, let alone between division rivals, but how about this for NYR/PHI, both of whom clearly need different kinds of shakeups?
To NYR: Sanheim, Tippett, Frost
To PHI: Krieder, Trouba, Othmann, +
Feels like a + from NYR would be needed... also, this deal would be just $50k going to NYR. From their perspective, it's a better balance of LD/RD in their top 4 (Sanheim-Fox, Miller-Schneider), and you can now move Laf to LW, bring Tippett in as a RW (not sure what lines would make the most sense)
For PHI, you get a significant prospect, plus add solid veteran leadership, including at a position of need (RD). They still need C help, but they have options. Trouba stays close to home. Only Sanheim has a full NMC, Kreider/Trouba have 15-team NTCs that PHI are probably not on.
Just something to put out there, obviously I am not intimately familiar how each team feels about each player...