User blog comment:Taxidriver256/Skin to win/@comment-24594279-20140316142429/@comment-5331854-20140317105748

It matters about as much as multiple ninjas in the same team having -1 Health for each additional ninja.

As far as I know, those buffs/debuffs are deactivated in Ranked games anyway (similar to how the Rengar/Kha'Zix-quest will not activate in Ranked).