With that trade not looking so good for the Twins, they're lucky that May has made some serious progress this year. While his 4.43 ERA isn't exciting at all, May has a 3.31 FIP for the contending Twins. According to FanGraphs, he's been worth 1.6 WAR (Wins Above Replacement) through 15 starts (19 appearances) despite having a 6-7 Win-Loss record. He's not going to run a .340 BABIP (batting average on balls in play) against all season, his strikeout rate is reasonable (7.7 K/9) and his walks have almost disappeared (1.90 BB/9).
Trevor May rookie cards are not incredibly expensive, which shouldn't be surprising. The 2015 Topps Baseball Card Trevor May RC is especially a bargain. While it may be premature to say that May is truly becoming an above-average starter, the amazing changes in his strikeout-to-walk ratio may be sustainable. It's not a bad time to buy low on a pitcher that may have finally figured things out. A lot of that credit probably has to go to new Twins pitching coach Neil Allen, who worked with the Rays for 7 years prior. May and fellow pitcher Kyle Gibson have both shown major improvement this year.
We'll see what the second half has in store for Trevor May. If he can keep up the pace with this outstanding strikeout-to-walk differential (4.05 K/BB), his cards may end up being a pretty good long-term investment. Even better for the Twins, that Revere trade no longer looks nearly as bad.