General Manager Brian Cashman has done an excellent job of identifying talented, but undervalued young players around the league and acquiring them for the Yankees at a discounted rate over the past two years. Didi Gregorius, Nathan Eovaldi, Aaron Hicks, and Dustin Ackley are all examples of this strategy.
While they may not all be hits, generally these are low-risk, high-reward moves, so when they pay off, you get a controllable young starter. Usually these moves are pretty under-the-radar, and no one sees them coming until the trade is more or less done.