In your format, you will need to pay a fortune and the logistics of your salary cap may prohibit a deal he will look at. He looks like he's in a rebuild and Alex is a key cog.
I know in my league it would cost you a top ten forward plus a stud on the backend to land Pietrangelo.
F-Datsyuk,C.Giroux,Kopitar,Read,Duchene,Z.Kassian,St amkos,Voracek,Hall,Seguin,Eberle,Couture,Ladd,Vrba ta,Kunitz,Vanek,Atkinson,Penner,Jagr,Bozak
F-G,A=1pt (14 count)
D-G,A=1pt,+- (8 count)
G-Win=3pts,T=1,SO=2,G,A=1 (3 count)
12 Team Dynasty