Gang up isn't broken it gives you no immediate value.. gang up is currently only good in mill rogue. the new rogue spell though could be good with this card. it's also good with tess. it gives a lot of value value rogue isn't yet a thing but a nice deck that streamers and casuals play..
As much as I hate it, it goes in Kingsbane rogue to give you more of those dude that pull your weapon. I can't think of the name of the card, I don't play that deck. I only hope Kingsbane doesn't get popular again. 1 mana 13/5 lifesteal weapons are no fun to play against.