Not sure what you mean by nothing Marchand hasn't done in playoff hockey.
I will admit that Marchand is a dirty rat fuck...but I love how a lot of Toronto fans are like "omg if Marchand did that he would not get suspended 3 games"...I'd like to point out that Marchand has been fined and suspended a whole lot of games for a whole lot less. And I don't believe he's done anything as dirty as what Kadri did (especially in light of Kadri being called for boarding about 5 minutes earlier against Wingels...he must have had something personal against him or something).
If anything, the refs and the NHL are in the bag for Toronto...they would love nothing more than to have them make it far. Too bad they won't :).