Would you trade Ty Conklin and Michal Rozsival for Alexander Semin in yahoo standard fantasy?

No. I'm sure you can get a better goaltender than Conklin who splits a lot of the duties with #1 Osgood. Try to fish around and send trades to try and get a true #1 starter IE; S. Mason, H. Lundqvist, R. Luongo, or N. Backstrom.