Raiders shopping TE Michael Mayer.
There's a draft coming up that's fairly rich with TE talent. Unless the Saints hold a higher grade on Mayer than anyone available in April, I think there's pretty much zero reason to make a trade for this guy before draft day, and only when/if they determine he's better than who's left on the board.
The only other scenario that makes sense is if the Raiders are selling now for considerably less than he's worth, but that would be a) unlikely b) detrimental since it would increase competition from other teams willing to give up a slightly better package of picks.