If we learned anything from last year’s MLB offseason, it’s that blockbuster trades are more likely to happen when previously untouchable prospects are made available.

By this time last year, the Royals had already dealt Wil Myers and three other prospects to the Rays in exchange for right-handers James Shields and Wade Davis.

Similarly, the Blue Jays’ last-minute decision to include top prospects Travis d’Arnaud and Noah Syndergaard in the trade for R.A. Dickey ultimately brought the deal together.

For the most part, teams have held true to their words this offseason regarding the availability of top prospects. However, that could change in a hurry as the remaining big-name free agents come off the board.

Here’s a look at four untouchable prospects who could command a huge return for their teams in a trade if made available.

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