I think people are way too rich with their offers here. King Felix is due roughly 3/60. He's not cheap. Also, he's got a very high injury risk, simply because all pitchers have very high injury risks. I don't think he gets dealt, unless maybe if Hal Steinbrenner decides to meddle on behalf of the Yankees. The Mariners aren't going to deal him unless they get a "King's Ransom." And rightly so, that fanbase is pissed off enough, dealing their one star for a mediocre package would cause riots. However, no well run team(again, except maybe the Yankees) is going to pay what he would cost, because when you account for his salary and his risk for injury, he doesn't have a ton of surplus value. In some magical world where pitchers aren't giant injury risks, yeah he's worth a ton. Something like Jackson, Mcnutt, and Vitters, plus maybe a bit more. However, we don't live in that world. In this world pitchers get hurt, constantly, and there's very little way to tell who will and who won't. I'm not sure he's worth that much more than Jackson alone when you account for pitcher attrition. He's certainly not worth Castro, that's absolutely laughable. Trading the farm for King Felix would be a Jim Hendry move, not a Theo Epstein move.