I'd do that in a heartbeat. Solves two of the biggest holes on the current roster for minimum salary. Frees up $4-5m to spend on pitching (or a catcher) to go with the $40-50m already there. Whatever Peterson ends up doing is just icing on the cake.

But I also think that's an unrealistically good trade, one that not even the Mets would make. The ideal trade partner, as needs match up, would probably be the Dodgers. The issue there is that they've not shown any kind of willingness to trade any young player they believe in. But let's imagine they're flexible on that for the sake or argument. With Urias here Gavin Lux is probably not an option anymore. But they have pitchers May or Gonsolin (Wouldn't be the headliner, but a useful addition to a better prospect), catchers like Will Smith (Probably untouchable though) and Keibert Ruiz. Makes a lot of sense on paper.

Generally I'm very much in favor of checking out the market for Hader. With a high asking price of course. Hader is one of the best relievers in the game, but relievers are volatile and they impact at most 5% of innings pitched (Even if those innings tend to be high-leverage ones). That's not to say they're not important, but it should still be the last area you focus on. If you can use a reliever, even a really good one, to fill two immediate needs elsewhere, you do it.

However I think it'll be a struggle to find a partner that matches up. Dodgers were discussed above. Astros kind of fit the same mould. But beyond that? Would the Mets really do that kind of deal again? Yankees seem to be collecting every reliever they can and they have the ammunition, but at some point even they will say enough is enough. Anyone else seems like a real long shot. Braves? Padres? If the White Sox really are serious this year?

I think ultimately no team meets the asking price, and Hader remains a Brewer.