If not up to Karlsson's level then he is a pretty good bet as a close second. I wouldn't make that trade.
10 Team Yahoo Roto
Keep 3F, 1D, 1G (to max 2 years unless franchise keeper)
3C,3LW,3RW,4D,2G,2BN,2IR Roto-play 85games/position
Player: G, A, +/-, PIM, PPA, PPG, HIT, BS SOG, FW
Goalie: W, GAA, SV, SV%, SHO
C: (F1) Tavares, Stastny, Carter
LW: 1-Hall, Pacioretty, B.Schenn
RW: Mackinnon, Nyquist, Hornqvist
D: 1-Carlson, Josi, Faulk, Franson
G: Andersen, Mason
BN: Jones, Niemi
#- denotes number of years I have kept a player. 2 = I need to trade him this year, (F1) = Franchise Keeper, up to 4 years.