Suarez will cost more than people think as he will probably be the best bat on the market if the Dbacks even put him on the market. There are a few teams with holes at 3B or even DH that will over pay in prospects. I think Suarez cost will be at least 1 5-10 team ranked prospect, 1 15-20, one lottery ticket from the DSL and one AAAA player. That is just not worth it for about a half of a season of Suarez.
I don't like McMahon never have and never will. I see him as an overrated player and someone that this board has somehow got a huge crush on. The Rockies won't part with him for the peanuts that have been suggested in trades here.
I don't want to see the Brewers trading from their prospect depth unless it is for someone like Sabathia, Greinke or Yelich (the younger version of Yelich). If the Brewers can get a deal that won't cost them top prospects then sure trade for Suarez but I don't believe this will be true. I also don't believe there is a Sabathia, Greinke or Yelich type on the market to trade for. At best you are looking at Suarez who may not even be available. The Dbacks are only 2.5 games back for the final wild card spot. Unless you are willing to give up someone on the roster now for Suarez and no Myers would not be of interest to the Dbacks. Patrick would probably be of more interest to the Dbacks and I think you would have to add in a prospect like Henderson or Adams to make the Dbacks consider a trade. That is just way too much for Suarez.