As someone who has liked Muzzin the most since he first joined the team, I have to say he hasn't been playing well in this series so far.
My first choice would be to slide Derms up with Holl. However, might not be a great idea, as Derms-Barrie has been quite good this series (no doubt because they're facing forward plugs). So, maybe just slide Rielly down and put Ceci with Marincin.
That said, Keefe might put Marincin with Holl because that was, if I'm not mistaken, his go to pairing in the Marlies Calder win.