The Toronto Maple Leafs are preparing for their first playoff run under head coach Sheldon Keefe. 

While it's actually a best of five play in round, the Leafs are still treating it like a playoff series. 

Keefe has already ignited some conversation with some of his line combos, but he blew some peoples minds with his latest experiment. 

The Leafs' head coach decided to put together an All-Star line of John Tavares, Auston Matthews and Mitch Marner.

"Obviously, they are three very good players. I have used them at different times in a game. I suspect it is something I would want to go back to at different times. Here now is a chance to get them some reps. An opportunity arises with Hyman coming out and being unfit to come in and play today. We wanted to sue that chance to mix things up and try some different things. Between the three of them playing together and getting JT some time on the wing, it helped us. We also got a look at Nylander in the middle at the same time and give him a chance to have some time there. I thought that served its purpose."

As mentioned by Keefe, this forced William Nylander over to center where he was on a line between Ilya Mikheyev and Adam Brooks. 

Nick Robertson was on a line with Alexander Kerfoot and Kasperi Kapanen. 

Here's a full look at the latest lines:

Tavares - Matthews - Marner 
Mikheyev - Nylander - Brooks
Robertson - Kerfoot - Kapanen
Clifford - Gauthier - Spezza

Muzzin - Holl 
Rielly - Dermott
Sandin - Ceci
Marincin - Barrie