Bart, I keep Varland, Jax, and Castro.
Jax, as a 7th inning or at times set-up guy still has real value despite his tendency to melt in high-leverage situations. Varland, and his contract absolutely should have remained a Twin: what a head scratcher that trade was! And, although Castro has been in a batting funk and, especially in the OF is a bit of a Dr. Strangeglove character, it's hard to give up a player who is so capable as a plug-in utility man and who also has decent speed and can get hot at times at the plate. Castro's versatility will be hard to replace.
Goodbye Bader: you were an excellent pick up for as long as it lasted, but you were never slated to be a Twin for long. He's an excellent fielder and occasional clutch hitter, but I must say that I've seldom seem a major leaguer swing from his heels at pitches so damn far out of the zone. He is an odd and flamboyant man and I will miss his eccentricity and crop-dusted cap, yet I've not quite forgotten his failure to snag what seemed to be a catchable ball off the bat of Freddie Freeman that would have secured a truly epic win over the vaunted Dodgers. Lefties hitting oppo can impart some awful spin on the ball, and maybe that was the reason for Bader's miss, yet it remains a stark and unfortunate memory for me from the several month long "Bader Era" in Minnesota.
Good luck in Philly Tots. Incidentally, the Twins may never again have a player whose first name was also the last name of two U.S. presidents...how about that fans?