If you are rebuilding then this seems like a great trade for you. Would you be able to get Halak to handcuff Greiss? Might be some up and down goaltending from Greiss this year. Raanta isn't a sure thing either - he's not proven and he may not even be with the same team next year. Take the pick and try to get Halak - Halak/Greiss should be around the same quality as Raanta this year, just costs another roster spot.