This is obviously not an original team and you will most probably see it in game. I have posted https://hearthstone-decks.net/mercenaries-pirate-build-by-stinkfist-7375-mmr/ before which usually does better since there are many Khadgars in the teams and you can use Edwin’s Round of Drinks to go around Blizzard and prevent being frozen before any merc from your bench can do anything. but since there are also lots and lots of bots using arcane comp, using this one you can climb real fast. just note that going against arcane, you cannot use the usual 1st turn deal of fear and you have to spend your first 2 turns killing Khadgar and then (after Valeera dies) you will bring Leeroy in to kill Medivh and Blink fox in 3rd turn.