Belt for Salazar
I think this is one that was fair in context, but worked out terribly.
Bauer for Olt
I don't really think I'll ever miss Bauer dearly, but I still picked him in the top 6 rounds of our big league start up draft and then sold him at the absolute worst time and didn't even get a keeper piece.
Corbin+Cingrani for Alex Gordon
I used to really regret doing that ^ deal, but it's funny how things turn around. At this point in time I really like my end of it, obviously.
I also regret cutting/dropping CoCo Crisp and trading Wily Peralta for almost nothing and trading Jimmy Nelson for almost nothing (but not really).
I'm experiencing recent bias here, surely there are more from S1 that I would regret.
Cano for Chris Davis isn't looking great right now, but I maintain hope. At least Cano is experiencing the expected SafeCo power outage.