I wasn't trying to define a specific offer for Marte; getting specific is even more hypothetical than just suggesting the name. I thought about Marte because he would fill a need for the Phillies, he plays for a team that likely is looking to save money (as evidenced by several recent trades, most notably Grrit Cole), and he has a contract situation where the Pirates may be looking to get something for him.
I'm not sure how important it is to say what I think is reasonable; I don't think the Pirates got a reasonable return for Cole, a much bigger prize, but they did it anyway. Generally speaking, I think the Phillies could part with players who are not likely to contribute in 2020 since a trade for Marte would make sense only if they were playing for now. Someone like Howard may well help in 2020 in some role, and I don't think it's necessary to trade our best prospect in such a deal. I am less optimistic about Bohm helping this coming season than some others, but he has the potential to help. I wouldn't rule out trading him, but it wouldn't be my first choice. But I would be willing to include a good prospect who is two or more years away along with current major league players who have potential and are not expensive. I don't think the Pirates would want Franco, for example, but maybe they would be interested in Velazquez and Pivetta? Who knows, maybe they'd take Jay Bruce. Maybe they would be interested in a package of three or four players, which is what they got for Cole.
It seems to me that one or two players like this are traded every off-season, often for packages that I wouldn't have thought were attractive enough. Maybe the Pirates would ask for too much, and so there is no deal. But I would like the Phillies to be thinking about these types of improvements, not just free agent acquisitions or trade the entire farm for one star deals.