Thanks guys - good question. My league only allows 3 keepers. And, you can only keep a guy 3 years. Its auction format, so keeper cost is whatever price you paid during draft. For Free Agents, we pay a flat $10 to keep, so Puig would cost me $10 to keep. Felix would cost me $35.
However, I'm not sure I'd keep Puig or Felix, anyways. Puig, in my mind, is still a big question mark, and I have a pretty good selection of possible keepers for next year: McCutcheon ($26), Goldschmidt ($10), Kipnis ($10), Harvey ($10), Donaldson ($10), Alvarez ($4), Marte ($2), Carpenter ($3),
This trade would be all about winning this year. Felix would give me a boost in Wins and Ks, strengthen my ratio stats (era, whip), and protect me against an injury to one of my other pitchers. So far I've been VERY lucky, my core SPs have not been injured, but pitchers always seem to be at risk of injury. Here's my core SP group: Harvey, Latos, Samardzija, CJ Wilson.
The one thing that holds me back from this trade. If this is all about getting Wins out of my pitchers (and locking in some value from Puig before he regresses), well, I'm in a Roto Points format. I'm 5 points behind the leader in that category. I have 49 Wins. The leader has 54. There's always the chance I make up the difference, even without Felix.
Any further insights would be great!