Lundestrom-McTavish-Silf worked for a few games before they were split apart. I don't think that would have worked long term because Silf would get tired, but that style might be good. Lundestrom-McTavish with an upgrade are RW. If the Ducks could swing something to land Kakko or if any of the young guys coming up are able to fill that Silf role (Gaucher?). I'd say Gauthier, but that would put arguably the two best shooters on the team on the same line. That leaves Terry, Gauthier, Vatrano, Killorn to fill in around Carlsson and Zegras. If that McTavish line works, you can have 3 very solid lines that can split the majority of the even strength minutes (give the 4th line 8-10 minutes), then load up 2 power play lines (Mac/Gauthier/Vatrano could all be the trigger man on one of the two units).