Earlier this week, Marlon Byrd and John Buck were sent to Pittsburgh for second baseman Dilson Herrera and a player to be named later (plus some cash). Now the player to be named later has been determined, and according to Ken Rosenthal, it is pitcher Vic Black. The righty appeared in three games for the Pirates this season but spent most of his time with triple-A Indianapolis, where he racked up 63 Ks in 46 2/3 IP while logging an ERA of 2.51.
Black presents a somewhat odd situation, trade-wise, since Pittsburgh placed him on waivers. However, per Rosenthal, if Black is claimed by some other team, the Pirates can pull him back and send him to the Mets at the conclusion of the season, rather than right now. So it seems sooner or later, the Mets will acquire him.
Steve Sypa wrote up a look at Herrera, who MLB.com's Jonathan Mayo dubbed the Pirates' 11th best prospect at the start of the season. At midseason, Black was considered that system's 15th best farmhand. There's a lengthy look at Black at MLB.com here, along with some brief video (short on game action, sadly). While it's hardly Beltran-for-Wheeler, and conceding that all minor leaguers' mileage vary, getting a team's #11 and 15 prospects for one month of Byrd and Buck is an impressive haul.