Garza is solid. Has an awesome slider, doesn't work that deep into games but he never really get injured. The stats say he's sightly lucky this year with his 4 ERA, but generally I think he can give us 3.6 ERA without missing starts for the rest of the season. Not an ace but about a number 3 pitcher for a contending team.
I'm a little reluctant to give away any real pieces for him, it's probably going to be a tight clash to the wildcards but with or without him even if the team makes the playoff I don't see them getting ahead the ALDS. I'll rather see a big move during the offseason, after all the surplus salary leaves (Dice, what is left of Youk, Jenks etc').