I'd give Hiura and Burnes/Peralta (or both). They'd probably ask for Hader, though. But yeah, they are going to ask for the moon, and would likely get it. Cost would be enormous, but getting a guy like Syndergaard would make the team the immediate favorite in the NL. Now that would cause me some pause. However, if they are truly rebuilding, I doubt they want a reliever on the MLB roster. I would assume it would be Hiura, Burnes, Peralta and our second best hitting prospect in their eyes. I would do it without hesitating. Hader is young enough (and cheap enough for the next several years) to be a major value to a rebuilding team. I can't see the Brewers trading major league contributors ... but, the last time they traded for someone of this magnitude (Greinke), MLB talent (Cain, Escobar) was part of the return. A team with the financial resources of the Mets may be looking at a short turn-around with a rebuild, which would make guys like Hader and Arcia possible targets.